{"record":{"id":"0284dca9a9bdc7bc","repo":"gofr-dev/gofr","slug":"failed-to-generate-signed-url-for-q-w","errorCode":null,"errorMessage":"failed to generate signed URL for %q: %w","messagePattern":"failed to generate signed URL for %q: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/gofr/datasource/file/common_fs.go","lineNumber":713,"sourceCode":"// Returns ErrSignedURLsNotSupported if the underlying provider does not implement SignedURLProvider.\nfunc (c *CommonFileSystem) GenerateSignedURL(ctx context.Context, name string, expiry time.Duration, opts *FileOptions) (string, error) {\n\tvar msg string\n\n\tst := StatusError\n\n\tstartTime := time.Now()\n\tdefer c.Observe(OpSignedURL, startTime, &st, &msg)\n\n\tsigner, ok := c.Provider.(SignedURLProvider)\n\tif !ok {\n\t\tmsg = fmt.Sprintf(\"provider %s does not support signed URLs\", c.ProviderName)\n\t\treturn \"\", fmt.Errorf(\"%w: %s\", ErrSignedURLsNotSupported, c.ProviderName)\n\t}\n\n\turl, err := signer.SignedURL(ctx, name, expiry, opts)\n\tif err != nil {\n\t\tmsg = fmt.Sprintf(\"failed to generate signed URL: %v\", err)\n\t\treturn \"\", fmt.Errorf(\"failed to generate signed URL for %q: %w\", name, err)\n\t}\n\n\tst = StatusSuccess\n\tmsg = fmt.Sprintf(\"Generated signed URL for %q (expires in %v)\", name, expiry)\n\n\treturn url, nil\n}\n","sourceCodeStart":695,"sourceCodeEnd":721,"githubUrl":"https://github.com/gofr-dev/gofr/blob/187eb24962502e91f1fee856230670958b66e89c/pkg/gofr/datasource/file/common_fs.go#L695-L721","documentation":"GenerateSignedURL in CommonFileSystem wraps any error returned by the underlying provider's SignedURL implementation with this message, preserving the original error via %w. It means the provider did implement SignedURLProvider, but the pre-signed URL generation itself failed (e.g. bad credentials, invalid object name, or provider-side rejection). Use errors.Is/As on the wrapped cause to identify the root reason.","triggerScenarios":"Calling CommonFileSystem.GenerateSignedURL(ctx, name, expiry, opts) when the provider's SignedURL(ctx, name, expiry, opts) returns a non-nil error — e.g. FTP/S3 provider rejects the object name, credentials are missing/expired, or the expiry/opts are invalid.","commonSituations":"Requesting signed URLs against providers whose SignedURL support is partial or unauthenticated; mistyped object names; expired cloud credentials; passing a zero or negative expiry that the provider rejects.","solutions":["Unwrap the error with errors.Is/errors.As (or %v in logs) to see the provider's underlying cause and fix that (credentials, object name, expiry).","Verify the provider actually supports signed URLs and is correctly connected/authenticated before calling GenerateSignedURL.","Check the object name exists and the FileOptions passed are valid for the provider.","Confirm the provider implements SignedURLProvider; if not, expect ErrSignedURLsNotSupported instead."],"exampleFix":"// before\nurl, err := fs.GenerateSignedURL(ctx, name, expiry, nil)\n// after\nif err != nil {\n    var cause error\n    if errors.As(err, &cause) { log.Printf(\"signed URL failed for %s: %v\", name, cause) }\n    if errors.Is(err, file.ErrSignedURLsNotSupported) { /* fall back to direct download */ }\n}","handlingStrategy":"try-catch","validationCode":"if _, ok := fs.(file.SignedURLProvider); !ok { return fallbackURL(name) }\nif name == \"\" || expiry <= 0 { return fmt.Errorf(\"invalid name or expiry\") }","typeGuard":"func supportsSignedURL(fs file.FileSystemProvider) (file.SignedURLProvider, bool) {\n    sp, ok := fs.(file.SignedURLProvider)\n    return sp, ok\n}","tryCatchPattern":"url, err := fs.GenerateSignedURL(ctx, name, expiry, opts)\nif err != nil {\n    if errors.Is(err, file.ErrSignedURLsNotSupported) {\n        return fallbackURL(name)\n    }\n    return fmt.Errorf(\"presign %q failed: %w\", name, err) // inspect wrapped cause\n}","preventionTips":["Confirm the provider implements SignedURLProvider before calling GenerateSignedURL.","Validate name and expiry before requesting the URL.","Always unwrap the returned error to log the provider's root cause.","Keep provider credentials fresh and connected before presigning."],"tags":["go","signed-url","file-storage","error-wrapping"],"backgroundTag":"signed-url-generation-failed","analyzedSha":"187eb24962502e91f1fee856230670958b66e89c","analyzedAt":"2026-09-01T20:34:54.554Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}