arcrun — AI workflow execution engine (clean history)
Self-hosted 開源：WASM 零件 + recipe + cypher-executor，跑在你自己的 Cloudflare。 此為重建的乾淨歷史起點（移除曾誤 commit 的 GCP SA 金鑰，舊歷史保留在 richblack/arcrun 與本地 backup 分支）。含： - acr init --self-hosted installer（建 KV/R2 + codeload 拉預編譯 wasm + wrangler deploy + seed recipe） - recipe push 把關（資料外流提醒 + 打通檢查） - 19 個正當零件預編譯 wasm（claude_api/km_writer/kbdb_upsert_block 排除：違反 DECISIONS §1） - CLI / cypher-executor / registry / 完整 SDD Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
uncle6me-web
@@ -0,0 +1,80 @@
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canonical_id: "auth_oauth2"
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display_name: "Auth Primitive — OAuth2"
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category: "auth"
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version: "v1"
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wasi_target: "preview1"
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stability: "floating"
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runtime_compat:
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- "cf-workers"
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- "workerd"
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- "wazero"
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constraints:
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max_size_kb: 2048
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max_cold_start_ms: 200
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no_network_syscall: false
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no_filesystem_syscall: true
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io_model: "stdin_stdout_json"
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input_schema:
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type: object
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required: [action, api_key, service]
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properties:
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action:
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type: string
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enum: [authenticate, needs_refresh, refresh]
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description: |
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authenticate — 用 refresh_token 換 access_token，展開 inject 模板
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needs_refresh — 檢查 token 是否需要 refresh（expires_at < now+300s）
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refresh — 強制重新 refresh，更新 CREDENTIALS_KV 中的 access_token/expires_at
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api_key:
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type: string
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description: 租戶識別（ak_ 前綴），用來組 {api_key}:cred:{name} KV key
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service:
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type: string
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description: auth recipe 名稱，對應 auth_recipe:{service} 的 KV 記錄
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request:
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type: object
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description: 下游零件的 HTTP request 上下文（保留，auth_oauth2 當前不使用）
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output_schema:
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type: object
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properties:
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success:
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type: boolean
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needs_refresh:
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type: boolean
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description: action=needs_refresh 時有效
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auth_headers:
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type: object
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additionalProperties:
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type: string
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auth_query:
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type: object
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additionalProperties:
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type: string
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auth_body:
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type: object
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additionalProperties:
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type: string
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runtime:
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type: object
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description: 含 access_token（action=authenticate/refresh 時有效）
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gherkin_tests:
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- scenario: "缺少 api_key"
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given: '{"action":"authenticate","service":"google"}'
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then_contains: '{"success":false'
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- scenario: "找不到 auth recipe"
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given: '{"action":"authenticate","api_key":"ak_test","service":"nonexistent_oauth2_svc"}'
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then_contains: '{"success":false'
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- scenario: "needs_refresh 無 expires_at"
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given: '{"action":"needs_refresh","api_key":"ak_test","service":"google"}'
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then_contains: '"needs_refresh":true'
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tags: [auth, credential, primitive, oauth2]
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description: |
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OAuth2 auth primitive。讀取 auth_recipe（含 token_endpoint、client_id、client_secret）
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+ 解密 refresh_token + 呼叫 token endpoint 換 access_token + 展開 {{runtime.access_token}}。
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支援 authenticate / needs_refresh / refresh 三個 action。
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透過 host function kv_get + crypto_decrypt + http_request，plaintext 永不離開 WASM。
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config_example: |
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auth_step:
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component: "auth_oauth2"
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action: "authenticate"
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service: "google_drive" # 對應 auth_recipe:google_drive 的 KV 記錄
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@@ -0,0 +1,514 @@
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// auth_oauth2 — OAuth2 auth primitive
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//
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// 讀取 auth_recipe:{service}（含 token_endpoint、client_id、client_secret）
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// + 解密 refresh_token + POST token endpoint 換 access_token
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// + 展開 {{runtime.access_token}} 模板。
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//
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// Actions:
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// - authenticate: 用 refresh_token 換 access_token，回傳注入後的 headers/query/body
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// - needs_refresh: 檢查 access_token 是否快過期（expires_at < now+300s）
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// - refresh: 強制重新 refresh，更新 KV 中的 cached_access_token/expires_at
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//
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// Host imports:
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// - u6u.kv_get — 讀 RECIPES + CREDENTIALS_KV
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// - u6u.kv_put — 寫回 cached_access_token/expires_at
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// - u6u.crypto_decrypt — AES-GCM 解密 refresh_token
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// - u6u.http_request — POST token endpoint
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//
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//go:build tinygo
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package main
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import (
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"encoding/json"
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"io"
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"net/url"
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"os"
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"strconv"
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"strings"
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"time"
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"unsafe"
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)
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// ── host function 宣告 ───────────────────────────────────────────────────────
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//go:wasmimport u6u kv_get
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func hostKvGet(
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keyPtr uintptr, keyLen uint32,
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outPtr uintptr, outLenPtr uintptr,
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) uint32
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//go:wasmimport u6u kv_put
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func hostKvPut(
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keyPtr uintptr, keyLen uint32,
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valPtr uintptr, valLen uint32,
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ttlSeconds uint32,
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) uint32
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//go:wasmimport u6u crypto_decrypt
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func hostCryptoDecrypt(
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encPtr uintptr, encLen uint32,
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ivPtr uintptr, ivLen uint32,
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outPtr uintptr, outLenPtr uintptr,
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) uint32
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//go:wasmimport u6u http_request
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func hostHttpRequest(
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urlPtr uintptr, urlLen uint32,
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methodPtr uintptr, methodLen uint32,
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headersPtr uintptr, headersLen uint32,
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bodyPtr uintptr, bodyLen uint32,
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outPtr uintptr, outLenPtr uintptr,
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) uint32
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// ── 型別 ─────────────────────────────────────────────────────────────────────
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type Input struct {
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Action string `json:"action"`
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APIKey string `json:"api_key"`
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Service string `json:"service"`
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Request json.RawMessage `json:"request,omitempty"`
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}
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type SecretRequirement struct {
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Key string `json:"key"`
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Label string `json:"label"`
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Optional bool `json:"optional,omitempty"`
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}
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type AuthInjectSpec struct {
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Header map[string]string `json:"header,omitempty"`
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Query map[string]string `json:"query,omitempty"`
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Body map[string]string `json:"body,omitempty"`
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}
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type OAuth2Config struct {
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TokenEndpoint string `json:"token_endpoint"`
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ClientID string `json:"client_id"`
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ClientSecret string `json:"client_secret"`
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Scopes []string `json:"scopes,omitempty"`
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}
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type AuthRecipe struct {
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Kind string `json:"kind"`
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Service string `json:"service"`
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Primitive string `json:"primitive"`
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OAuth2 *OAuth2Config `json:"oauth2,omitempty"`
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RequiredSecrets []SecretRequirement `json:"required_secrets"`
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Inject AuthInjectSpec `json:"inject"`
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}
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type EncryptedRecord struct {
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Encrypted string `json:"encrypted"`
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IV string `json:"iv"`
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}
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type TokenResponse struct {
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AccessToken string `json:"access_token"`
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ExpiresIn int `json:"expires_in"`
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RefreshToken string `json:"refresh_token,omitempty"`
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Error string `json:"error"`
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ErrorDesc string `json:"error_description"`
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}
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// ── main ─────────────────────────────────────────────────────────────────────
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func main() {
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raw, err := io.ReadAll(os.Stdin)
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if err != nil {
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writeError("failed to read stdin: " + err.Error())
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return
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}
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var input Input
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if err := json.Unmarshal(raw, &input); err != nil {
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writeError("invalid input JSON: " + err.Error())
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return
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}
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if input.APIKey == "" {
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writeError("api_key 必填")
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return
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}
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if input.Service == "" {
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writeError("service 必填")
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return
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}
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action := input.Action
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if action == "" {
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action = "authenticate"
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}
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// 讀 auth recipe
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recipeJSON, status := kvGet("auth_recipe:" + input.Service)
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if status == 2 {
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writeError("找不到 auth recipe: " + input.Service)
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return
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}
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if status != 0 {
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writeError("kv_get 失敗(auth_recipe)")
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return
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}
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var recipe AuthRecipe
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if err := json.Unmarshal([]byte(recipeJSON), &recipe); err != nil {
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writeError("auth recipe JSON 解析失敗: " + err.Error())
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return
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}
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if recipe.Primitive != "oauth2" {
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writeError("auth recipe " + input.Service + " 的 primitive 不是 oauth2（是 " + recipe.Primitive + "）")
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return
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}
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if recipe.OAuth2 == nil || recipe.OAuth2.TokenEndpoint == "" {
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writeError("auth recipe " + input.Service + " 缺少 oauth2.token_endpoint")
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return
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}
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switch action {
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case "needs_refresh":
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handleNeedsRefresh(input, recipe)
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case "refresh":
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handleRefresh(input, recipe)
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case "authenticate":
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handleAuthenticate(input, recipe)
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default:
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writeError("不支援的 action: " + action)
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}
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}
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// ── action handlers ───────────────────────────────────────────────────────────
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func handleNeedsRefresh(input Input, recipe AuthRecipe) {
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// 讀 cached expires_at（若無，視為需要 refresh）
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expiresKey := input.APIKey + ":oauth2:" + input.Service + ":expires_at"
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expiresStr, status := kvGet(expiresKey)
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if status != 0 {
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// 找不到 = 需要 refresh
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out, _ := json.Marshal(map[string]interface{}{
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"success": true,
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"needs_refresh": true,
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})
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os.Stdout.Write(out)
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return
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}
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expiresAt, err := strconv.ParseInt(strings.TrimSpace(expiresStr), 10, 64)
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if err != nil {
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out, _ := json.Marshal(map[string]interface{}{
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"success": true,
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"needs_refresh": true,
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})
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os.Stdout.Write(out)
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return
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}
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// 提前 5 分鐘視為需要 refresh
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needsRefresh := time.Now().Unix()+300 >= expiresAt
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out, _ := json.Marshal(map[string]interface{}{
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"success": true,
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"needs_refresh": needsRefresh,
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})
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os.Stdout.Write(out)
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}
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func handleRefresh(input Input, recipe AuthRecipe) {
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accessToken, expiresAt, ok := doRefresh(input, recipe)
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if !ok {
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return
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}
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// 快取新 token
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cacheAccessToken(input.APIKey, input.Service, accessToken, expiresAt)
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out, _ := json.Marshal(map[string]interface{}{
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"success": true,
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"runtime": map[string]string{"access_token": accessToken},
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"auth_headers": map[string]string{},
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"auth_query": map[string]string{},
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"auth_body": map[string]string{},
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})
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os.Stdout.Write(out)
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}
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func handleAuthenticate(input Input, recipe AuthRecipe) {
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// 先嘗試讀 cached access_token
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cachedKey := input.APIKey + ":oauth2:" + input.Service + ":access_token"
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expiresKey := input.APIKey + ":oauth2:" + input.Service + ":expires_at"
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cachedToken, cStatus := kvGet(cachedKey)
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expiresStr, eStatus := kvGet(expiresKey)
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var accessToken string
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var expiresAt int64
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useCache := false
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if cStatus == 0 && eStatus == 0 && cachedToken != "" {
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if exp, err := strconv.ParseInt(strings.TrimSpace(expiresStr), 10, 64); err == nil {
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if time.Now().Unix()+300 < exp {
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accessToken = cachedToken
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expiresAt = exp
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useCache = true
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}
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}
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}
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if !useCache {
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var ok bool
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accessToken, expiresAt, ok = doRefresh(input, recipe)
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if !ok {
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return
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}
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cacheAccessToken(input.APIKey, input.Service, accessToken, expiresAt)
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}
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runtime := map[string]string{"access_token": accessToken}
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secrets := map[string]string{} // oauth2 inject 只用 runtime.*，不用 secret.*
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authHeaders := interpolateRecord(recipe.Inject.Header, secrets, runtime)
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authQuery := interpolateRecord(recipe.Inject.Query, secrets, runtime)
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authBody := interpolateRecord(recipe.Inject.Body, secrets, runtime)
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out, _ := json.Marshal(map[string]interface{}{
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"success": true,
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"auth_headers": authHeaders,
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"auth_query": authQuery,
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"auth_body": authBody,
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"runtime": runtime,
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})
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os.Stdout.Write(out)
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}
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// doRefresh 解密 refresh_token，打 token endpoint，回傳 (access_token, expires_at_unix, ok)
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func doRefresh(input Input, recipe AuthRecipe) (string, int64, bool) {
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if len(recipe.RequiredSecrets) == 0 {
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writeError("auth recipe " + input.Service + " 缺少 required_secrets（需要 refresh_token）")
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return "", 0, false
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}
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// 慣例：required_secrets[0] 是 refresh_token
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rtReq := recipe.RequiredSecrets[0]
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kvKey := input.APIKey + ":cred:" + rtReq.Key
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encJSON, s := kvGet(kvKey)
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if s == 2 {
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writeError("缺少 credential: " + rtReq.Key + "（" + rtReq.Label + "）。執行 acr creds push 推送")
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return "", 0, false
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}
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if s != 0 {
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writeError("kv_get 失敗(credential " + rtReq.Key + ")")
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return "", 0, false
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}
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var rec EncryptedRecord
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if err := json.Unmarshal([]byte(encJSON), &rec); err != nil {
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writeError("credential " + rtReq.Key + " 格式錯誤: " + err.Error())
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return "", 0, false
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}
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refreshToken, ok := cryptoDecrypt(rec.Encrypted, rec.IV)
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if !ok {
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writeError("credential " + rtReq.Key + " 解密失敗")
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return "", 0, false
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}
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// POST token endpoint（form-urlencoded）
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cfg := recipe.OAuth2
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form := url.Values{}
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form.Set("grant_type", "refresh_token")
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form.Set("refresh_token", refreshToken)
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form.Set("client_id", cfg.ClientID)
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form.Set("client_secret", cfg.ClientSecret)
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formBody := form.Encode()
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headersJSON := `{"Content-Type":"application/x-www-form-urlencoded"}`
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respStr, ok2 := httpRequest(cfg.TokenEndpoint, "POST", headersJSON, formBody)
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if !ok2 {
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writeError("token endpoint HTTP 請求失敗")
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return "", 0, false
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}
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|
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var tokenResp TokenResponse
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if err := json.Unmarshal([]byte(respStr), &tokenResp); err != nil {
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writeError("token endpoint 回應解析失敗: " + err.Error())
|
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return "", 0, false
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}
|
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if tokenResp.AccessToken == "" {
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msg := tokenResp.Error
|
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if tokenResp.ErrorDesc != "" {
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msg += ": " + tokenResp.ErrorDesc
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}
|
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if msg == "" {
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msg = "access_token 為空"
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}
|
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writeError("token exchange 失敗: " + msg)
|
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return "", 0, false
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}
|
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|
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expiresIn := tokenResp.ExpiresIn
|
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if expiresIn <= 0 {
|
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expiresIn = 3600
|
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}
|
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expiresAt := time.Now().Unix() + int64(expiresIn)
|
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|
||||
// 若 token endpoint 回傳新的 refresh_token（部分服務會 rotate），更新快取
|
||||
// 注意：寫回加密 KV 需要 host 支援；此處只快取 access_token（明文短效）
|
||||
// refresh_token 的 rotation 需要 kv_put_encrypted host function（未來擴充）
|
||||
|
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return tokenResp.AccessToken, expiresAt, true
|
||||
}
|
||||
|
||||
func cacheAccessToken(apiKey, service, accessToken string, expiresAt int64) {
|
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// 快取明文 access_token（短效，TTL = expires_at - now + 60s buffer）
|
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ttl := uint32(expiresAt - time.Now().Unix() + 60)
|
||||
if ttl > 7200 {
|
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ttl = 7200
|
||||
}
|
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|
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cachedKey := apiKey + ":oauth2:" + service + ":access_token"
|
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expiresKey := apiKey + ":oauth2:" + service + ":expires_at"
|
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expiresStr := strconv.FormatInt(expiresAt, 10)
|
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|
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kvPut(cachedKey, accessToken, ttl)
|
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kvPut(expiresKey, expiresStr, ttl)
|
||||
}
|
||||
|
||||
// ── helpers ───────────────────────────────────────────────────────────────────
|
||||
|
||||
func writeError(msg string) {
|
||||
out, _ := json.Marshal(map[string]interface{}{
|
||||
"success": false,
|
||||
"error": msg,
|
||||
"auth_headers": map[string]string{},
|
||||
"auth_query": map[string]string{},
|
||||
"auth_body": map[string]string{},
|
||||
})
|
||||
os.Stdout.Write(out)
|
||||
}
|
||||
|
||||
func kvGet(key string) (string, uint32) {
|
||||
keyBytes := []byte(key)
|
||||
outBuf := make([]byte, 65536)
|
||||
var outLen uint32
|
||||
|
||||
status := hostKvGet(
|
||||
uintptr(unsafe.Pointer(&keyBytes[0])), uint32(len(keyBytes)),
|
||||
uintptr(unsafe.Pointer(&outBuf[0])), uintptr(unsafe.Pointer(&outLen)),
|
||||
)
|
||||
if status != 0 {
|
||||
return "", status
|
||||
}
|
||||
return string(outBuf[:outLen]), 0
|
||||
}
|
||||
|
||||
func kvPut(key, value string, ttlSeconds uint32) {
|
||||
keyBytes := []byte(key)
|
||||
valBytes := []byte(value)
|
||||
if len(keyBytes) == 0 || len(valBytes) == 0 {
|
||||
return
|
||||
}
|
||||
hostKvPut(
|
||||
uintptr(unsafe.Pointer(&keyBytes[0])), uint32(len(keyBytes)),
|
||||
uintptr(unsafe.Pointer(&valBytes[0])), uint32(len(valBytes)),
|
||||
ttlSeconds,
|
||||
)
|
||||
}
|
||||
|
||||
func cryptoDecrypt(encB64, ivB64 string) (string, bool) {
|
||||
encBytes := []byte(encB64)
|
||||
ivBytes := []byte(ivB64)
|
||||
if len(encBytes) == 0 || len(ivBytes) == 0 {
|
||||
return "", false
|
||||
}
|
||||
outBuf := make([]byte, 65536)
|
||||
var outLen uint32
|
||||
|
||||
status := hostCryptoDecrypt(
|
||||
uintptr(unsafe.Pointer(&encBytes[0])), uint32(len(encBytes)),
|
||||
uintptr(unsafe.Pointer(&ivBytes[0])), uint32(len(ivBytes)),
|
||||
uintptr(unsafe.Pointer(&outBuf[0])), uintptr(unsafe.Pointer(&outLen)),
|
||||
)
|
||||
if status != 0 {
|
||||
return "", false
|
||||
}
|
||||
return string(outBuf[:outLen]), true
|
||||
}
|
||||
|
||||
func httpRequest(reqURL, method, headersJSON, body string) (string, bool) {
|
||||
urlBytes := []byte(reqURL)
|
||||
methodBytes := []byte(method)
|
||||
headersBytes := []byte(headersJSON)
|
||||
bodyBytes := []byte(body)
|
||||
|
||||
if len(urlBytes) == 0 {
|
||||
return "", false
|
||||
}
|
||||
|
||||
outBuf := make([]byte, 65536)
|
||||
var outLen uint32
|
||||
|
||||
var bodyPtr uintptr
|
||||
if len(bodyBytes) > 0 {
|
||||
bodyPtr = uintptr(unsafe.Pointer(&bodyBytes[0]))
|
||||
}
|
||||
var headersPtr uintptr
|
||||
if len(headersBytes) > 0 {
|
||||
headersPtr = uintptr(unsafe.Pointer(&headersBytes[0]))
|
||||
}
|
||||
|
||||
status := hostHttpRequest(
|
||||
uintptr(unsafe.Pointer(&urlBytes[0])), uint32(len(urlBytes)),
|
||||
uintptr(unsafe.Pointer(&methodBytes[0])), uint32(len(methodBytes)),
|
||||
headersPtr, uint32(len(headersBytes)),
|
||||
bodyPtr, uint32(len(bodyBytes)),
|
||||
uintptr(unsafe.Pointer(&outBuf[0])), uintptr(unsafe.Pointer(&outLen)),
|
||||
)
|
||||
if status != 0 {
|
||||
return "", false
|
||||
}
|
||||
return string(outBuf[:outLen]), true
|
||||
}
|
||||
|
||||
func interpolateTemplate(template string, secrets, runtime map[string]string) string {
|
||||
var b strings.Builder
|
||||
b.Grow(len(template))
|
||||
i := 0
|
||||
for i < len(template) {
|
||||
start := strings.Index(template[i:], "{{")
|
||||
if start < 0 {
|
||||
b.WriteString(template[i:])
|
||||
break
|
||||
}
|
||||
b.WriteString(template[i : i+start])
|
||||
openIdx := i + start
|
||||
closeRel := strings.Index(template[openIdx+2:], "}}")
|
||||
if closeRel < 0 {
|
||||
b.WriteString(template[openIdx:])
|
||||
break
|
||||
}
|
||||
inner := template[openIdx+2 : openIdx+2+closeRel]
|
||||
advance := openIdx + 2 + closeRel + 2
|
||||
|
||||
switch {
|
||||
case strings.HasPrefix(inner, "secret."):
|
||||
key := inner[len("secret."):]
|
||||
b.WriteString(secrets[key])
|
||||
case strings.HasPrefix(inner, "runtime."):
|
||||
key := inner[len("runtime."):]
|
||||
b.WriteString(runtime[key])
|
||||
default:
|
||||
b.WriteString(template[openIdx:advance])
|
||||
}
|
||||
i = advance
|
||||
}
|
||||
return b.String()
|
||||
}
|
||||
|
||||
func interpolateRecord(record map[string]string, secrets, runtime map[string]string) map[string]string {
|
||||
if record == nil {
|
||||
return map[string]string{}
|
||||
}
|
||||
result := make(map[string]string, len(record))
|
||||
for k, v := range record {
|
||||
result[k] = interpolateTemplate(v, secrets, runtime)
|
||||
}
|
||||
return result
|
||||
}
|
||||
Reference in New Issue
Block a user