Ability to build `file_upload` content dynamically

[khitrenovich]

Hello,

I'm trying to upload multiple files to a thread. This works like a charm with files.uploadV2 method and file_uploads in payload when I have a static list of files. However, I need to upload all files in a given directory without known what's there ahead of time.

I tried to build the array of files as follows (same technique works, for example, for defining matrix jobs) -

    - id: prepare-files
      if: ${{ inputs.attachment_dir }}
      shell: bash
      run: |
        count=$(find "${{ github.workspace }}/${{ inputs.attachment_dir }}" -type f | wc -l)
        uploads=$(find "${{ github.workspace }}/${{ inputs.attachment_dir }}" -type f | jq -Rsc 'split("\n") | map(select(length > 0)) | map({file: ., filename: (. | split("/") | last)})')
        echo "count=${count}" >> $GITHUB_OUTPUT
        echo "uploads=${uploads}" >> $GITHUB_OUTPUT
    - id: upload-files
      uses: slackapi/slack-github-action@v2.0.0
      if: ${{ inputs.attachment_dir && steps.prepare-files.outputs.count > 0 }}
      with:
        method: files.uploadV2
        token: ${{ inputs.bot_token }}
        errors: true
        payload: |
          channel_id: ${{ steps.send-message.outputs.channel_id }}
          thread_ts: "${{ steps.send-message.outputs.ts }}"
          file_uploads: ${{ fromJSON(steps.prepare-files.outputs.uploads) }}

This results in

Run slackapi/slack-github-action@v2.0.0
  with:
    method: files.uploadV2
    token: ***
    errors: true
    payload: channel_id: ***
  thread_ts: "***"
  file_uploads: Array
  
    payload-templated: false
    retries: 5
Error: SlackError: options.file_uploads.map is not a function

file:///home/runner/work/_actions/slackapi/slack-github-action/v2.0.0/node_modules/@slack/web-api/dist/file-upload.js:4
    return new (P || (P = Promise))(function (resolve, reject) {
^
TypeError: options.file_uploads.map is not a function
    at file:///home/runner/work/_actions/slackapi/slack-github-action/v2.0.0/node_modules/@slack/web-api/dist/file-upload.js:83:1
    at Generator.next (<anonymous>)
    at file:///home/runner/work/_actions/slackapi/slack-github-action/v2.0.0/node_modules/@slack/web-api/dist/file-upload.js:8:1
    at new Promise (<anonymous>)
    at __webpack_modules__.2577.__awaiter (file:///home/runner/work/_actions/slackapi/slack-github-action/v2.0.0/node_modules/@slack/web-api/dist/file-upload.js:4:1)
    at getMultipleFileUploadJobs (file:///home/runner/work/_actions/slackapi/slack-github-action/v2.0.0/node_modules/@slack/web-api/dist/file-upload.js:80:1)
    at WebClient.<anonymous> (file:///home/runner/work/_actions/slackapi/slack-github-action/v2.0.0/node_modules/@slack/web-api/dist/WebClient.js:401:1)
    at Generator.next (<anonymous>)
    at file:///home/runner/work/_actions/slackapi/slack-github-action/v2.0.0/node_modules/@slack/web-api/dist/WebClient.js:31:1
    at new Promise (<anonymous>)

I tried to convert the whole payload to JSON format, but I'm running into the same error.
Do you have any ideas?

Thanks in advance!

[khitrenovich]

Shortly after posting I realized that I can do it with external payload file -

    - id: prepare-payload
      if: ${{ inputs.attachment_dir }}
      shell: bash
      run: |
        count=$(find "${{ github.workspace }}/${{ inputs.attachment_dir }}" -type f | wc -l)
        find "${{ github.workspace }}/${{ inputs.attachment_dir }}" -type f |\
          jq -Rs \
            --arg channel "${{ steps.send-message.outputs.channel_id }}" \
            --arg thread "${{ steps.send-message.outputs.ts }}" \
            '
              split("\n") |
              map(select(length > 0)) |
              map({file: ., filename: (. | split("/") | last)}) |
              {
                channel_id: $channel,
                thread_ts: $thread,
                file_uploads: .
              }
            ' > payload.json
        echo "count=${count}" >> $GITHUB_OUTPUT
    - id: upload-files
      uses: slackapi/slack-github-action@v2.0.0
      if: ${{ inputs.attachment_dir && steps.prepare-payload.outputs.count > 0 }}
      with:
        method: files.uploadV2
        token: ${{ inputs.bot_token }}
        errors: true
        payload-file-path: payload.json