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WOPI server - bridge module

This module includes the code once prototyped at https://github.com/cs3org/wopibridge, to integrate collaborative editors such as CodiMD and Etherpad (partially supported for the time being). The approach is generic to allow for extending the concept to other Office-like applications exposing a minimal load/save REST API.

The module provides two endpoints:

  • /wopi/bridge/<docid> auto-called by the app backends when some changes are detected on the open document referenced as <docid>
  • /wopi/bridge/list for operators only, it returns a list of all currently opened files in bridge mode

The module implements a stateless server, as all context information is stored in WOPI locks or passed through arguments. Collaborative editing and locking of files is supported by means of the following WOPI APIs:

  • GetFileInfo: get all file metadata
  • GetFile: get the file content
  • GetLock: check if the file is locked
  • Lock: lock a file on open for write
  • PutFile: store a file's content
  • PutRelative: store a file under a different name
  • Unlock: unlock a file on close
  • Delete: delete a previous edition of a file

CodiMD specifics

  • Support for readonly (publish or slide) mode vs. read/write mode
  • Inclusion of pictures supported according to file extension:
    • For plain .md files, directly incorporating pictures is disabled, but a cloud file-picker is enabled to allow incorporating links to external pictures
    • If a file is created as .zmd (for zipped markdown), it is possible to include pictures and the save to WOPI is executed as a zipped bundle, including all pictures (if any) in the bundle. On load, .zmd files are transparently expanded to CodiMD

Required CodiMD APIs

  • /new push a new file to a random <noteid>
  • /<noteid> display a file, or reserve a <noteid> if not existing
  • /<noteid>/publish display a file in readonly mode
  • /<noteid>/slide display a file in slide mode
  • /<noteid>/download get a raw file to store it back
  • /uploadimage upload a new picture
  • /uploads/upload_<hash> get an uploaded picture
  • /api/notes/<noteid> update a file via PUT

Etherpad specifics

This is still work in progress as the etherpad plugin is incomplete.

  • Support for readonly and read/write files
  • Automatic save via dedicated ep_sciencemesh plugin