uncle6me-web
8e9bd09072
真因：零件（main.go）給 host function 的接收緩衝區是固定大小（http_request 64KB、
claude_api 1MB）。回應超過這個大小時，wasi-shim 的 writeOut 照寫不誤：
new Uint8Array(buf, outPtr, data.length).set(data)
data 比零件的 outBuf 大 → 覆寫零件堆積體，零件接著 outBuf[:outLen] 切片 panic；
或 writeOut 撞 memory 邊界丟例外 → 回 1 → 零件印一句 "HTTP request failed"。
使用者照那句去查連線／URL／防火牆，方向全錯。
修法（容量握手，不改 host function 簽名、向後相容）：
- 零件呼叫前把 outBuf 長度預先寫進 *outLenPtr（宣告容量）
- host 在寫回前讀這個值當上限；塞不下就**不寫**（不再覆寫零件記憶體），回新的
HOST_TOO_LARGE=3
- http_request host fn 收到 3 → 改寫一段講真話的 error envelope（實際大小＋上限＋
「不是連線失敗」＋分頁/篩選的具體做法＋機器可讀 code/actual_bytes/limit_bytes），
沿用既有 parsed["error"] 判定鏈原樣送到使用者面前
- 舊零件沒宣告容量（讀到 0）→ 維持舊行為。不可硬套 64KB 預設：各零件緩衝區大小不同，
硬套會把原本正常的大回應誤判成「太大」，那只是換一種說謊
同一條路徑上另一個「訊息與真因脫節」一併修：component-loader 的 makeHttpRunner
`try res.json() catch res.text()`，在零件回非 JSON 時 body 已被消費 → 丟
"Body has already been used"，與真因無關（同檔 readBodyOnce 的註解早就寫明這個坑）。
改成只讀一次。
驗證狀態（誠實標示，mindset §7）：
- 通：5 顆零件 tinygo build 全過，wasm 已重編進 .component-builds/
（claude_api 依 .gitignore 慣例不入庫，由部署端重編）
- 未跑：runtime 驗證。本 session 的權限層擋掉 node/vitest/wasmtime，
before/after 實測輸出待人跑 scripts/repro-oversize-response.mjs
- 未做：.worker-builds/ 重編（需 node scripts/build-worker-artifacts.mjs），
否則修法不會進 self-hosted 安裝路徑（Arcrun#93 同款陷阱）
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
534 lines
16 KiB
Go
534 lines
16 KiB
Go
// 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 回傳碼，與 cypher-executor/src/lib/wasi-shim.ts 的 HOST_* 同一組。
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const (
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hostOK uint32 = 0
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hostError uint32 = 1
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hostTooLarge uint32 = 3 // 資料塞不進零件宣告的接收緩衝區（Arcrun#92）
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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, code := httpRequest(cfg.TokenEndpoint, "POST", headersJSON, formBody)
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if code == hostTooLarge {
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writeError("token endpoint 的回應太大，裝不下：超過這個零件單次能接收的 64 KB 上限。" +
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"這不是連線失敗——請求有送出去、對方也有回，只是整包塞不進零件。" +
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"多半表示 " + cfg.TokenEndpoint + " 回的不是正常的 token JSON（例如回了一整頁 HTML 錯誤頁）；" +
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"請確認 auth recipe 的 token_endpoint 指向正確的 token 端點。")
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return "", 0, false
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}
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if code != hostOK {
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writeError("token endpoint 沒有拿到回應：引擎的 host function 回傳錯誤碼 " +
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strconv.Itoa(int(code)) + "（0=成功 1=引擎端錯誤 3=回應太大）。這是引擎側的問題。")
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return "", 0, false
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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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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
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// 注意：寫回加密 KV 需要 host 支援；此處只快取 access_token（明文短效）
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// refresh_token 的 rotation 需要 kv_put_encrypted host function（未來擴充）
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return tokenResp.AccessToken, expiresAt, true
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}
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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)
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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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kvPut(cachedKey, accessToken, ttl)
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kvPut(expiresKey, expiresStr, ttl)
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}
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// ── helpers ───────────────────────────────────────────────────────────────────
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func writeError(msg string) {
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out, _ := json.Marshal(map[string]interface{}{
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"success": false,
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"error": msg,
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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 kvGet(key string) (string, uint32) {
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keyBytes := []byte(key)
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outBuf := make([]byte, 65536)
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outLen := uint32(len(outBuf)) // 容量握手（Arcrun#92），見 wasi-shim.ts writeOut
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status := hostKvGet(
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uintptr(unsafe.Pointer(&keyBytes[0])), uint32(len(keyBytes)),
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uintptr(unsafe.Pointer(&outBuf[0])), uintptr(unsafe.Pointer(&outLen)),
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)
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if status != 0 {
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return "", status
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}
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return string(outBuf[:outLen]), 0
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}
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func kvPut(key, value string, ttlSeconds uint32) {
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keyBytes := []byte(key)
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valBytes := []byte(value)
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if len(keyBytes) == 0 || len(valBytes) == 0 {
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return
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}
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hostKvPut(
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uintptr(unsafe.Pointer(&keyBytes[0])), uint32(len(keyBytes)),
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uintptr(unsafe.Pointer(&valBytes[0])), uint32(len(valBytes)),
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ttlSeconds,
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)
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}
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func cryptoDecrypt(encB64, ivB64 string) (string, bool) {
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encBytes := []byte(encB64)
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ivBytes := []byte(ivB64)
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if len(encBytes) == 0 || len(ivBytes) == 0 {
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return "", false
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}
|
||
outBuf := make([]byte, 65536)
|
||
outLen := uint32(len(outBuf)) // 容量握手（Arcrun#92）
|
||
|
||
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
|
||
}
|
||
|
||
// httpRequest 回傳 (回應原文, host function 回傳碼)。
|
||
// 回傳碼與 wasi-shim.ts 的 HOST_* 同一組：0=成功 1=引擎端錯誤 3=回應塞不下緩衝區。
|
||
// 之所以不再只回 bool：bool 把「連不上」和「回應太大」混成同一句話，
|
||
// 使用者拿到 "token endpoint HTTP 請求失敗" 會往連線方向查，方向全錯（Arcrun#92）。
|
||
func httpRequest(reqURL, method, headersJSON, body string) (string, uint32) {
|
||
urlBytes := []byte(reqURL)
|
||
methodBytes := []byte(method)
|
||
headersBytes := []byte(headersJSON)
|
||
bodyBytes := []byte(body)
|
||
|
||
if len(urlBytes) == 0 {
|
||
return "", hostError
|
||
}
|
||
|
||
outBuf := make([]byte, 65536)
|
||
outLen := uint32(len(outBuf)) // 容量握手（Arcrun#92）
|
||
|
||
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 "", status
|
||
}
|
||
return string(outBuf[:outLen]), hostOK
|
||
}
|
||
|
||
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
|
||
}
|