Implement Interactive Dialog - File upload sample - #218
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Limit details: You’ve used all 1 included review currently available under your plan. 📝 WalkthroughWalkthroughThe plugin adds a file-upload dialog with optional file fields and a description. Commands open or clear persisted values. A new endpoint creates posts with attached files and stores per-user file IDs. Go and dependency versions are updated. ChangesFile upload dialog workflow
Dependency and toolchain updates
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The PR adds a file-upload dialog sample and related commands without any actionable merge-blocking risk remaining; it is merge-ready after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant User
participant CommandHooks
participant FileUploadDialog
participant DialogEndpoint
participant MattermostAPI
participant KVStorage
User->>CommandHooks: Run file-upload command
CommandHooks->>KVStorage: Load stored file IDs
CommandHooks->>FileUploadDialog: Open dialog with defaults
User->>DialogEndpoint: Submit dialog
DialogEndpoint->>MattermostAPI: Create post with attached files
DialogEndpoint->>KVStorage: Save file IDs by element
DialogEndpoint-->>User: Return submission status
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Actionable comments posted: 3
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Inline comments:
In `@server/command_hooks.go`:
- Around line 567-573: Update the file-upload-clear case to capture the
*model.AppError returned by p.API.KVDelete and return an appropriate error
response when it is non-nil; only return the existing ephemeral success response
after deletion succeeds.
In `@server/http_hooks.go`:
- Around line 1090-1101: Update the file-ID persistence block to normalize IDs
from both request.Submission and request.FileIds into stored, then always
replace the user’s KV entry with the current state or delete it when no files
are submitted. Ensure the flow preserves accepted single_file and multi_file
formats so command_hooks restoration cannot reuse stale IDs.
- Around line 1030-1034: Update the dialog error handling around GetUser and
CreatePost so processing failures write HTTP 200 with a JSON error response
rather than an empty or unwritten response. Preserve the existing logging and
early returns, and use the established dialog error-response format or helper if
available.
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go.modserver/command_hooks.goserver/dialog_samples.goserver/http_hooks.go
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I'm exited to see file uploads in dialogs now!
Modal state doesn't clear after upload
I'm surprised to see that the modal keeps it's state after it has been uploaded. Is that the default pattern we want to suggest other to adopt? It seems contrary to how handle the dialog state today.
Dropzone
Not a blocker: I would love to see dropzone upload similar to what I'm doing in mattermost/mattermost#37569
How that is handled is up to the plugin. I wrote it this way intentionally to demo the ability of a plugin to keep the existing state or be able to clear it via
That's awesome. That wouldn't be handled in the plugin though. That needs to be added to the mattermost core functionality. I have created a Jira Ticket to implement this. See https://mattermost.atlassian.net/browse/MM-70302 |
2 participants
Summary
Add file upload sample to Interactive Dialog demos
Demonstrates the file dialog element type, including single and multiple file uploads.
New slash commands
Handler (server/http_hooks.go) — POST /dialog/file-upload posts a bot message summarizing the submission with the uploaded files attached via FileIds. Reads file IDs from request.FileIds, falling back to parsing comma-separated IDs out of the submission values. Handles the cancel case with its own message.
Persistence — submitted file IDs are stored in the KV store per user (file_upload_) and pre-populated as element Default values when the dialog is reopened, so previously uploaded files carry over.
Ticket Link
Fixes https://mattermost.atlassian.net/browse/MM-69122