jim800121chen 3e45532f55 fix(model-download): 改 redirect/query-string token 下載,根除 CORS preflight 405
模型庫下載原本前端用 fetch + Authorization: Bearer 跨 origin 直連 FAA,
觸發 CORS preflight(OPTIONS);FAA 未設 CORS、OPTIONS 回 405 → 下載失敗。

FAA 設計本就支援「token 放 query string(access_token) + redirect 導航下載」,
故不需 FAA 設 CORS。改採 ADR-017 §11 v1.3 乙案:

- backend: download_url 組成含 ?access_token={url.QueryEscape(token)} 完整 FAA URL;
  ModelDownloadResponse.Token 標 deprecated 保留(向下相容);token 不進 log
- frontend: 移除 downloadModelFile/deriveDownloadFilename(fetch+blob),
  改 triggerNavDownload 用 <a download href> 導航;ModelDownloadGrant 移除 token 欄
- 整條鏈無 CORS:前端→backend 同 origin、前端→FAA 導航無 preflight

docs: ADR-017 增補 §11(v1.3) + TDD.md §9.5
tests: backend 8 PASS(含 token escape 邊界)、frontend 35 PASS;Reviewer 通過(0C/0M)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-27 06:18:05 +08:00

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// models.go — /api/models/* 的 handler 實作。
//
// 雛形重點:
// - GET /api/models列當前 user 的模型ModelRepo in-memory
// - GET /api/models/:id取單一模型 metadata
// - POST /api/models/init兩階段上傳第一步 — 驗證輸入、產 storageKey 與 presigned PUT URL
// - POST /api/models/:id/finalize第二步 — 驗證檔案已存在storage.Exists與大小標為 ready
// - DELETE /api/models/:id軟刪
//
// **兩階段上傳Init → PUT → Finalize的設計理由**
// - 讓前端直接 PUT 到 storage不佔 api-server 記憶體 / bandwidth
// - Phase 0 LocalFS 用假 presigned URLPhase 1 S3 用原生 presigned URL
//
// 對齊 api-spec.md §4、feature-model-management.md。
package api
import (
"context"
"encoding/json"
"errors"
"net/http"
"net/url"
"strings"
"time"
"github.com/gin-gonic/gin"
"github.com/google/uuid"
"visiona-backend/internal/model"
"visiona-backend/internal/storage"
)
// modelUploadURLTTL 是 presigned PUT URL 的存活時間。
const modelUploadURLTTL = 15 * time.Minute
// registerModelRoutes 註冊 /api/models/* 的 routes。
func registerModelRoutes(g *gin.RouterGroup, deps Deps) {
g.GET("/models", modelsListHandler(deps))
g.GET("/models/:id", modelsGetHandler(deps))
g.POST("/models/init", modelsInitUploadHandler(deps))
g.POST("/models/:id/finalize", modelsFinalizeHandler(deps))
g.DELETE("/models/:id", modelsDeleteHandler(deps))
// Phase 0.9 模型庫 model 直連 FAA 下載ADR-017 (a))。
g.GET("/models/:id/download", modelsDownloadHandler(deps))
// load-to-device 雛形先 stub完整實作需要 presigned GET + 透過 tunnel 送指令給 local agent
g.POST("/models/:id/load-to-device", func(c *gin.Context) {
WriteNotImplemented(c, "models.load-to-device — pending Phase 1")
})
}
// ModelResponse 是 API 回傳的 Model DTO對應 api-spec.md §4 的格式。
type ModelResponse struct {
ID string `json:"id"`
Name string `json:"name"`
Description string `json:"description,omitempty"`
TargetChip string `json:"target_chip,omitempty"`
FileSize int64 `json:"file_size"`
Source string `json:"source"`
Status string `json:"status"` // "pending" / "ready"
// 模型 metadataB4 鏈路最後一個序列化點)。
// snake_case 對齊本 DTO 既有慣例target_chip / file_size / created_at
// 前端 model-store normalize 雙吃 snake/camelinput_shape(snake) 在其讀取範圍內。
// omitempty上傳類 / 舊 model 無 metadata 時不輸出,不破壞既有回應結構。
InputShape []int `json:"input_shape,omitempty"`
Classes []string `json:"classes,omitempty"`
Framework string `json:"framework,omitempty"`
CreatedAt time.Time `json:"created_at"`
UpdatedAt time.Time `json:"updated_at"`
UploadedAt *time.Time `json:"uploaded_at,omitempty"`
}
// toModelResponse 把 domain model 轉為 API DTO「status」由 UploadedAt 是否 set 決定。
func toModelResponse(m *model.Model) ModelResponse {
status := "pending"
if m.UploadedAt != nil {
status = "ready"
}
return ModelResponse{
ID: m.ID,
Name: m.Name,
Description: m.Description,
TargetChip: m.TargetChip,
FileSize: m.FileSize,
Source: m.Source,
Status: status,
InputShape: m.InputShape,
Classes: m.Classes,
Framework: m.Framework,
CreatedAt: m.CreatedAt,
UpdatedAt: m.UpdatedAt,
UploadedAt: m.UploadedAt,
}
}
// modelsListHandler 實作 GET /api/models。
func modelsListHandler(deps Deps) gin.HandlerFunc {
return func(c *gin.Context) {
if deps.ModelRepo == nil {
WriteSuccess(c, http.StatusOK, []ModelResponse{})
return
}
// Phase 0.7 security fix C1 (見 .autoflow/05-implementation/review/phase-0.7-security-audit.md)
uc, ok := UserContextFrom(c)
if !ok || uc.UserID == "" {
WriteError(c, http.StatusInternalServerError, ErrCodeInternalError,
"missing user context (auth middleware misconfigured?)", nil)
return
}
userID := uc.UserID
ctx, cancel := context.WithTimeout(c.Request.Context(), 3*time.Second)
defer cancel()
models, err := deps.ModelRepo.List(ctx, model.ListFilter{OwnerUserID: userID})
if err != nil {
// 塊 5.4DB 錯誤經 errors.go 映射PG down → 503其餘 → 500不洩漏 raw DB error。
WriteDBError(c, deps.Logger, "list models", err)
return
}
out := make([]ModelResponse, 0, len(models))
for _, m := range models {
out = append(out, toModelResponse(m))
}
WriteSuccess(c, http.StatusOK, out)
}
}
// modelsGetHandler 實作 GET /api/models/:id。
func modelsGetHandler(deps Deps) gin.HandlerFunc {
return func(c *gin.Context) {
if deps.ModelRepo == nil {
WriteError(c, http.StatusNotFound, ErrCodeNotFound, "model not found", nil)
return
}
id := c.Param("id")
if id == "" {
WriteError(c, http.StatusBadRequest, ErrCodeValidationFailed, "model id required", nil)
return
}
// Phase 0.7 security fix C1 (見 .autoflow/05-implementation/review/phase-0.7-security-audit.md)
uc, ok := UserContextFrom(c)
if !ok || uc.UserID == "" {
WriteError(c, http.StatusInternalServerError, ErrCodeInternalError,
"missing user context (auth middleware misconfigured?)", nil)
return
}
userID := uc.UserID
ctx, cancel := context.WithTimeout(c.Request.Context(), 2*time.Second)
defer cancel()
m, err := deps.ModelRepo.Get(ctx, id)
if err != nil {
if errors.Is(err, model.ErrNotFound) {
WriteError(c, http.StatusNotFound, ErrCodeNotFound, "model not found", nil)
return
}
// 塊 5.4DB 錯誤經 errors.go 映射PG down → 503其餘 → 500不洩漏 raw DB error。
WriteDBError(c, deps.Logger, "get model", err)
return
}
if m.OwnerUserID != userID {
WriteError(c, http.StatusForbidden, ErrCodeForbidden, "not owner", nil)
return
}
WriteSuccess(c, http.StatusOK, toModelResponse(m))
}
}
// ModelInitRequest 是 POST /api/models/init 的 request body。
type ModelInitRequest struct {
Name string `json:"name"`
FileSize int64 `json:"file_size"`
Checksum string `json:"checksum,omitempty"` // sha256 hexPhase 1 驗)
TargetChip string `json:"target_chip,omitempty"`
Description string `json:"description,omitempty"`
}
// ModelInitResponse 是 POST /api/models/init 的 response data。
type ModelInitResponse struct {
ModelID string `json:"model_id"`
UploadURL string `json:"upload_url"`
UploadExpiresAt time.Time `json:"upload_expires_at"`
StorageKey string `json:"storage_key"`
}
// modelsInitUploadHandler 實作 POST /api/models/init。
//
// 流程:
// 1. 驗證 requestname 必填、file_size 不能超過配置)
// 2. 產新 model_id + storage_key`models/{userID}/{modelID}.nef`
// 3. 用 storage.PresignedPutURL 取 PUT URL
// 4. 在 ModelRepo 建立 pending 紀錄UploadedAt = nil
// 5. 回應 model_id + upload_url
//
// 錯誤413 PAYLOAD_TOO_LARGE、400 VALIDATION_FAILED、501storage/repo 未設)
func modelsInitUploadHandler(deps Deps) gin.HandlerFunc {
return func(c *gin.Context) {
if deps.ModelRepo == nil || deps.Storage == nil {
WriteNotImplemented(c, "model repo or storage not configured")
return
}
var req ModelInitRequest
if err := json.NewDecoder(c.Request.Body).Decode(&req); err != nil {
WriteError(c, http.StatusBadRequest, ErrCodeValidationFailed,
"invalid JSON: "+err.Error(), nil)
return
}
// 驗證 name
if strings.TrimSpace(req.Name) == "" {
WriteError(c, http.StatusBadRequest, ErrCodeValidationFailed,
"name is required", []FieldError{{Field: "name", Message: "cannot be empty"}})
return
}
// 驗證 file_size > 0 且不超過上限
if req.FileSize <= 0 {
WriteError(c, http.StatusBadRequest, ErrCodeValidationFailed,
"file_size must be > 0",
[]FieldError{{Field: "file_size", Message: "must be positive"}})
return
}
// 大小上限檢查MaxUploadSizeMB 取自 Deps若為 0 則不限,給測試友善)
if deps.MaxUploadSizeMB > 0 {
limit := int64(deps.MaxUploadSizeMB) * 1024 * 1024
if req.FileSize > limit {
WriteError(c, http.StatusRequestEntityTooLarge, ErrCodePayloadTooLarge,
"file_size exceeds upload limit",
[]FieldError{{Field: "file_size",
Message: "max allowed is configured by server"}})
return
}
}
// Phase 0.7 security fix C1 (見 .autoflow/05-implementation/review/phase-0.7-security-audit.md)
uc, ok := UserContextFrom(c)
if !ok || uc.UserID == "" {
WriteError(c, http.StatusInternalServerError, ErrCodeInternalError,
"missing user context (auth middleware misconfigured?)", nil)
return
}
userID := uc.UserID
modelID := uuid.NewString()
storageKey := "models/" + userID + "/" + modelID + ".nef"
ctx, cancel := context.WithTimeout(c.Request.Context(), 5*time.Second)
defer cancel()
// 產 presigned PUT URL
uploadURL, err := deps.Storage.PresignedPutURL(ctx, storageKey, modelUploadURLTTL)
if err != nil {
// 塊 5 Minor-1storage 錯誤統一映射,不把 raw errbucket/endpoint 等)洩漏給前端。
WriteStorageError(c, deps.Logger, "presigned put url", err)
return
}
// 建立 pending 紀錄
now := time.Now().UTC()
m := &model.Model{
ID: modelID,
OwnerUserID: userID,
Name: req.Name,
Description: req.Description,
TargetChip: req.TargetChip,
FileSize: req.FileSize,
FileChecksum: req.Checksum,
StorageKey: storageKey,
Source: model.SourceUploaded,
CreatedAt: now,
UpdatedAt: now,
// UploadedAt 保持 nil 直到 finalize
}
if err := deps.ModelRepo.Save(ctx, m); err != nil {
// 塊 5.4DB 錯誤經 errors.go 映射PG down → 503其餘 → 500不洩漏 raw DB error。
WriteDBError(c, deps.Logger, "save model", err)
return
}
logOrDefault(deps.Logger).Info("models: upload init",
"model_id", modelID,
"user_id", userID,
"file_size", req.FileSize,
"request_id", RequestIDFrom(c))
WriteSuccess(c, http.StatusOK, ModelInitResponse{
ModelID: modelID,
UploadURL: uploadURL,
UploadExpiresAt: now.Add(modelUploadURLTTL),
StorageKey: storageKey,
})
}
}
// modelsFinalizeHandler 實作 POST /api/models/:id/finalize。
//
// 流程:
// 1. 取 modelownership 檢查)
// 2. 透過 storage.Stat 驗證檔案已存在
// 3. 驗證 Stat().Size == model.FileSize雛形只做 size 比對Phase 1 加 checksum
// 4. 更新 UploadedAt存回 Repo
//
// 錯誤:
// - 檔案還沒 PUT → 400 VALIDATION_FAILED (file not uploaded)
// - Size 不符 → 400 VALIDATION_FAILED (size mismatch)
func modelsFinalizeHandler(deps Deps) gin.HandlerFunc {
return func(c *gin.Context) {
if deps.ModelRepo == nil || deps.Storage == nil {
WriteNotImplemented(c, "model repo or storage not configured")
return
}
id := c.Param("id")
if id == "" {
WriteError(c, http.StatusBadRequest, ErrCodeValidationFailed, "model id required", nil)
return
}
// Phase 0.7 security fix C1 (見 .autoflow/05-implementation/review/phase-0.7-security-audit.md)
uc, ok := UserContextFrom(c)
if !ok || uc.UserID == "" {
WriteError(c, http.StatusInternalServerError, ErrCodeInternalError,
"missing user context (auth middleware misconfigured?)", nil)
return
}
userID := uc.UserID
ctx, cancel := context.WithTimeout(c.Request.Context(), 5*time.Second)
defer cancel()
m, err := deps.ModelRepo.Get(ctx, id)
if err != nil {
if errors.Is(err, model.ErrNotFound) {
WriteError(c, http.StatusNotFound, ErrCodeNotFound, "model not found", nil)
return
}
// 塊 5.4DB 錯誤經 errors.go 映射PG down → 503其餘 → 500不洩漏 raw DB error。
WriteDBError(c, deps.Logger, "get model", err)
return
}
if m.OwnerUserID != userID {
WriteError(c, http.StatusForbidden, ErrCodeForbidden, "not owner", nil)
return
}
// 驗證檔案已存在
obj, statErr := deps.Storage.Stat(ctx, m.StorageKey)
if statErr != nil {
if errors.Is(statErr, storage.ErrNotFound) {
WriteError(c, http.StatusBadRequest, ErrCodeValidationFailed,
"file not uploaded yet; PUT to upload_url first", nil)
return
}
// 塊 5 Minor-1storage 錯誤統一映射,不把 raw errbucket/endpoint 等)洩漏給前端。
WriteStorageError(c, deps.Logger, "stat object", statErr)
return
}
// Size 驗證(雛形只比對 sizePhase 1 加 checksum
if obj.Size != m.FileSize {
WriteError(c, http.StatusBadRequest, ErrCodeValidationFailed,
"uploaded size mismatch",
[]FieldError{
{Field: "file_size", Message: "declared vs actual differ"},
})
return
}
// 標記 ready
now := time.Now().UTC()
m.UploadedAt = &now
m.UpdatedAt = now
if err := deps.ModelRepo.Save(ctx, m); err != nil {
// 塊 5.4DB 錯誤經 errors.go 映射PG down → 503其餘 → 500不洩漏 raw DB error。
WriteDBError(c, deps.Logger, "save model", err)
return
}
logOrDefault(deps.Logger).Info("models: upload finalized",
"model_id", m.ID,
"user_id", userID,
"size", m.FileSize,
"request_id", RequestIDFrom(c))
WriteSuccess(c, http.StatusOK, toModelResponse(m))
}
}
// modelsDeleteHandler 實作 DELETE /api/models/:id。
//
// 雛形行為軟刪ModelRepo.Delete 已做軟刪)。
// 是否一併刪 storage 檔案 — 雛形保留檔案(方便 debugPhase 1 接 S3 後,
// 建議由後台 worker 在 grace period 後刪除(避免使用者誤刪)。
func modelsDeleteHandler(deps Deps) gin.HandlerFunc {
return func(c *gin.Context) {
if deps.ModelRepo == nil {
WriteNotImplemented(c, "model repo not configured")
return
}
id := c.Param("id")
if id == "" {
WriteError(c, http.StatusBadRequest, ErrCodeValidationFailed, "model id required", nil)
return
}
// Phase 0.7 security fix C1 (見 .autoflow/05-implementation/review/phase-0.7-security-audit.md)
uc, ok := UserContextFrom(c)
if !ok || uc.UserID == "" {
WriteError(c, http.StatusInternalServerError, ErrCodeInternalError,
"missing user context (auth middleware misconfigured?)", nil)
return
}
userID := uc.UserID
ctx, cancel := context.WithTimeout(c.Request.Context(), 3*time.Second)
defer cancel()
// Ownership 檢查
m, err := deps.ModelRepo.Get(ctx, id)
if err != nil {
if errors.Is(err, model.ErrNotFound) {
WriteError(c, http.StatusNotFound, ErrCodeNotFound, "model not found", nil)
return
}
// 塊 5.4DB 錯誤經 errors.go 映射PG down → 503其餘 → 500不洩漏 raw DB error。
WriteDBError(c, deps.Logger, "get model", err)
return
}
if m.OwnerUserID != userID {
WriteError(c, http.StatusForbidden, ErrCodeForbidden, "not owner", nil)
return
}
if err := deps.ModelRepo.Delete(ctx, id); err != nil {
if errors.Is(err, model.ErrNotFound) {
WriteError(c, http.StatusNotFound, ErrCodeNotFound, "model not found", nil)
return
}
// 塊 5.4DB 錯誤經 errors.go 映射PG down → 503其餘 → 500不洩漏 raw DB error。
WriteDBError(c, deps.Logger, "delete model", err)
return
}
logOrDefault(deps.Logger).Info("models: deleted",
"model_id", id,
"user_id", userID,
"request_id", RequestIDFrom(c))
c.Status(http.StatusNoContent)
}
}
// ModelDownloadResponse 是 GET /api/models/:id/download 的 response data。
//
// ADR-017 v1.3§11瀏覽器下載改 query-string token + redirect 導航,避開 CORS
// preflight 405。後端組好「已含 ?access_token= 的完整 URL」決策 A 乙案Client
// 把 DownloadURL 當不透明連結直接導航下載——不經 visionA、不經 AWS。
type ModelDownloadResponse struct {
// DownloadURL 是 FAA 下載 URL已含 `?access_token=``{FAABaseURL}/files/{object_key}?access_token={token}`)。
// 可直接瀏覽器導航下載,無需自行帶 header / 拼 queryADR-017 §11.3 乙案)。
DownloadURL string `json:"download_url"`
// Token 是 MC 簽的 opaque download tokenfdt_
//
// DeprecatedADR-017 v1.3 §11.3token 已併入 DownloadURL 的 ?access_token=
// Client 不應再單獨使用本欄位。保留純為向下相容(舊 local-tool / 既有 consumer 可能仍讀)。
Token string `json:"token"`
// ExpiresAt 是 token 到期時間RFC3339 / UTCMC 沒回填時為零值(前端不應依賴)。
ExpiresAt time.Time `json:"expires_at,omitempty"`
}
// modelsDownloadHandler 實作 GET /api/models/:id/downloadADR-017 (a) 模型庫直連 FAA 下載)。
//
// 流程(對齊 adr-017 §10.3 e2e 藍本 + 決策 2
// 1. ownership 驗(第一階段 owner-onlyB 分享是後續階段)
// 2. model 必須有 FAAObjectKey= 轉檔→promote 類);上傳類(空 key回 501Q7 範圍框死)
// 3. FileAccessIssuer 簽 MC download tokenfdt_
// 4. 回 {download_url, token, expires_at} 給 Client 直連 FAA
//
// 錯誤:
// - issuer / FAABaseURL 未配置deps.FileAccessIssuer == nil→ 501 NOT_IMPLEMENTED
// - model 不存在 / 非 owner → 404 / 403
// - 上傳類 model無 FAAObjectKey→ 501 NOT_IMPLEMENTED明確訊息
// - 簽 token 失敗MC 不可用)→ 502 INTERNAL_ERROR對外 mask不洩漏 MC 內部狀態)
func modelsDownloadHandler(deps Deps) gin.HandlerFunc {
return func(c *gin.Context) {
if deps.ModelRepo == nil {
WriteError(c, http.StatusNotFound, ErrCodeNotFound, "model not found", nil)
return
}
// FAA 直連下載未啟用cfg.FileAccess.Enabled() == false → main.go 不 wire
if deps.FileAccessIssuer == nil || deps.FAABaseURL == "" {
WriteNotImplemented(c, "model FAA download not configured (set VISIONA_FILE_ACCESS_* env)")
return
}
id := c.Param("id")
if id == "" {
WriteError(c, http.StatusBadRequest, ErrCodeValidationFailed, "model id required", nil)
return
}
// Phase 0.7 security fix C1 (見 .autoflow/05-implementation/review/phase-0.7-security-audit.md)
uc, ok := UserContextFrom(c)
if !ok || uc.UserID == "" {
WriteError(c, http.StatusInternalServerError, ErrCodeInternalError,
"missing user context (auth middleware misconfigured?)", nil)
return
}
userID := uc.UserID
ctx, cancel := context.WithTimeout(c.Request.Context(), 5*time.Second)
defer cancel()
m, err := deps.ModelRepo.Get(ctx, id)
if err != nil {
if errors.Is(err, model.ErrNotFound) {
WriteError(c, http.StatusNotFound, ErrCodeNotFound, "model not found", nil)
return
}
// 塊 5.4DB 錯誤經 errors.go 映射PG down → 503其餘 → 500不洩漏 raw DB error。
WriteDBError(c, deps.Logger, "get model", err)
return
}
// 第一階段 owner-onlyB 分享後續階段);非 owner 回 403。
if m.OwnerUserID != userID {
WriteError(c, http.StatusForbidden, ErrCodeForbidden, "not owner", nil)
return
}
// 第一階段只支援「轉檔→promote 進 FAA」類 model有 FAAObjectKey
// 上傳類 model 只在 visionA 自己 storage、不在 FAA無法直連ADR-017 Q7 範圍框死)。
if m.FAAObjectKey == "" {
WriteNotImplemented(c,
"uploaded models do not support FAA direct download in this phase (only converted models)")
return
}
// 簽 MC download tokenfdt_。userID = OIDC subMC 真實 user
// objectKey 必須與 FAA GET path key 一致(= 簽 token 時的 object_key
issued, err := deps.FileAccessIssuer.IssueDownloadToken(ctx, userID, m.FAAObjectKey)
if err != nil {
// 對外 mask 成 502不洩漏「MC 不可用 / token 簽發細節」這類內部運維狀態);
// SRE 從 server log 的 error 看 fileaccess sentinel 分類。
logOrDefault(deps.Logger).Warn("models: download token issue failed",
"model_id", m.ID,
"user_id", userID,
"err", err.Error(),
"request_id", RequestIDFrom(c))
WriteError(c, http.StatusBadGateway, ErrCodeInternalError,
"download token service unavailable", nil)
return
}
// 組對外 download_url{FAABaseURL}/files/{object_key}?access_token={token}。
// object_key 內含 '/'models/{userID}/{jobID}.nef需逐段 escape 但保留 '/'。
// ADR-017 v1.3§11.3 乙案token 以 query string 併入 URLFAA 原生支援 access_token
// query、§11.2),由後端用 url.QueryEscape 統一 escape對齊 FAA test page 的
// Uri.EscapeDataString。path 此時不含 query直接 append `?access_token=` 即可。
// 注意downloadURL含 token絕不寫進 logtoken 維持不洩漏原則)。
downloadURL := strings.TrimRight(deps.FAABaseURL, "/") + "/files/" + escapeFAAObjectKey(m.FAAObjectKey) +
"?access_token=" + url.QueryEscape(issued.Token)
logOrDefault(deps.Logger).Info("models: download token issued",
"model_id", m.ID,
"user_id", userID,
"request_id", RequestIDFrom(c))
WriteSuccess(c, http.StatusOK, ModelDownloadResponse{
DownloadURL: downloadURL,
Token: issued.Token,
ExpiresAt: issued.ExpiresAt,
})
}
}
// escapeFAAObjectKey 對 FAA object_key 逐段 path-escape保留 '/' 為 path separator。
//
// object_key 形如 models/{userID}/{jobID}.nefuserID(OIDC sub) / jobID(UUID) 都是
// 安全字元,但仍逐段 url.PathEscape 防禦(避免任何特殊字元破壞 URL 結構)。
// 不整體 PathEscape 是因為那會把 '/' 變 %2F破壞 FAA `/files/{**objectKey}` 的 path 比對。
func escapeFAAObjectKey(objectKey string) string {
segs := strings.Split(objectKey, "/")
for i, s := range segs {
segs[i] = url.PathEscape(s)
}
return strings.Join(segs, "/")
}