lectern.click

lectern_offer_media

AMDP control plane: cite a raster/video by sha256, byteLength, and mimeType. Does not send pixels. Returns disposition have (bind immediately) or intake (plane-put, merkle-slice, or json-chunk). Try AMDP intakes in this order until lectern_media_status present is true (or offer disposition is have), then lectern_compress_media if it is a raster, lectern_bind_media, and STOP. Do not skip a later rank because an earlier one failed. Do not keep transferring after success. 1) cas-hit: bind immediately. 2) plane-put: stage the file in the OS temp directory (%TEMP% / $TMPDIR), not the workspace — Chrome’s upload tool often has no workspace roots and only allows temp. Create a temporary on this page, append it to document.body, and leave it there (Lectern hides it visually). Upload that temp file. The page plane-puts on change. Optional: read arrayBuffer() in-page → window.__lecternAmdp.put. If DOM.setFileInputFiles is denied or files stay empty, go to rank 3. Never pass base64 through evaluate_script.args. Do not use a section Attach-media picker. 3) merkle-slice: re-offer with merkleLeaves, then lectern_put_media_slice until complete. 4) json-chunk: lectern_begin_media_upload → append → commit. Last rank, still required if 1–3 failed. Call lectern_compress_media so the page shrinks the raster (do not recompress with your image generator), then lectern_bind_media with the returned sha256.

Page: /

Input schema

{
  "type": "object",
  "properties": {
    "sha256": {
      "type": "string",
      "description": "SHA-256 of the raw bytes, 64 hex characters"
    },
    "byteLength": {
      "type": "number",
      "description": "Exact byte length of the file"
    },
    "mimeType": {
      "type": "string",
      "description": "Raster or video MIME type, e.g. image/jpeg"
    },
    "filename": {
      "type": "string",
      "description": "Optional original filename"
    },
    "width": {
      "type": "number",
      "description": "Optional pixel width"
    },
    "height": {
      "type": "number",
      "description": "Optional pixel height"
    },
    "merkleChunkSize": {
      "type": "number",
      "description": "Optional Merkle slice size in bytes"
    },
    "merkleLeaves": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Optional SHA-256 hex of each slice, in order, for lectern_put_media_slice"
    }
  },
  "required": [
    "sha256",
    "byteLength",
    "mimeType"
  ],
  "additionalProperties": false
}