{"record":{"id":"99bf38fc436f3c40","repo":"chenhg5/cc-connect","slug":"wecom-write-image-data-w","errorCode":null,"errorMessage":"wecom: write image data: %w","messagePattern":"wecom: write image data: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"platform/wecom/wecom.go","lineNumber":557,"sourceCode":"\treturn nil\n}\n\n// uploadImageMedia uploads an image to WeChat Work media API and returns the media_id.\nfunc (p *Platform) uploadImageMedia(accessToken string, img core.ImageAttachment) (string, error) {\n\tname := img.FileName\n\tif name == \"\" {\n\t\tname = \"image.png\"\n\t}\n\n\tbody := &bytes.Buffer{}\n\twriter := multipart.NewWriter(body)\n\n\tpart, err := writer.CreateFormFile(\"media\", name)\n\tif err != nil {\n\t\treturn \"\", fmt.Errorf(\"wecom: create form file: %w\", err)\n\t}\n\tif _, err := part.Write(img.Data); err != nil {\n\t\treturn \"\", fmt.Errorf(\"wecom: write image data: %w\", err)\n\t}\n\tif err := writer.Close(); err != nil {\n\t\treturn \"\", fmt.Errorf(\"wecom: close multipart writer: %w\", err)\n\t}\n\n\tapiURL := p.wecomAPIURL(\"/cgi-bin/media/upload\", url.Values{\n\t\t\"access_token\": []string{accessToken},\n\t\t\"type\":         []string{\"image\"},\n\t})\n\tresp, err := p.apiClient.Post(apiURL, writer.FormDataContentType(), body)\n\tif err != nil {\n\t\treturn \"\", fmt.Errorf(\"wecom: upload image: %w\", err)\n\t}\n\tdefer resp.Body.Close()\n\n\tvar result struct {\n\t\tErrCode int    `json:\"errcode\"`\n\t\tErrMsg  string `json:\"errmsg\"`","sourceCodeStart":539,"sourceCodeEnd":575,"githubUrl":"https://github.com/chenhg5/cc-connect/blob/4000b2338aa6e850c99df54f8b0ed6ed7460b401/platform/wecom/wecom.go#L539-L575","documentation":"Wrap of the Write call that copies img.Data into the multipart form part. Writing to a bytes.Buffer cannot fail (only panics on OOM), so this is a defensive wrap around the io.Writer error contract rather than a realistically reachable error path.","triggerScenarios":"Thrown at platform/wecom/wecom.go:557 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Treat as unreachable defensive code; log and abort the image upload if it ever appears","No configuration or input change can trigger it under normal memory conditions"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"4000b2338aa6e850c99df54f8b0ed6ed7460b401","analyzedAt":"2026-09-06T11:45:09.575Z","contentChangedAt":"2026-09-06T11:45:09.575Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}