Ported from https://github.com/thosmos/filelink-owncloud to support Thunderbird 68.*

Author: guillaumev

build.sh

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+#!/bin/bash
+cd src; zip -r ../../nextcloud-filelink-$1.xpi .

screenshots/addon-about.png

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+{
+  "extensionName": {
+    "message": "Nextcloud for Filelink",
+    "description": "Name of the extension"
+  },
+  "extensionDescription": {
+    "message": "Nextcloud provider for Thunderbird Filelink",
+    "description": "Description of the extension"
+  },
+  "serviceName": {
+    "message": "Nextcloud",
+    "description": "Name of the service"
+  },
+  "serverURLLabel": {
+    "message": "WebDAV URL"
+  },
+  "serverURLDesc": {
+    "message": "Your Personal WebDAV file path can be found under Settings in the lower left of the Files screen."
+  },
+  "usernameLabel": {
+    "message": "Username"
+  },
+  "usernameDesc": {
+    "message": "Your NextCloud username"
+  },
+  "tokenLabel": {
+    "message": "App Token / Password"
+  },
+  "tokenDesc": {
+    "message": "An app token (preferrable) or password. Generate an app token via User -> Settings -> Security -> App Token.  WARNING: this token is stored insecurely.  NOTE: this may require the OAuth2 plugin on the server."
+  },
+  "pathLabel": {
+    "message": "Storage Path"
+  },
+  "pathDesc": {
+    "message": "The path where the files are stored in OwnCloud (it must already exist on the server)"
+  }
+}

screenshots/config.png

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+/**
+ * @copyright Copyright (c) 2020, Thomas Spellman ([email protected])
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+var uploads = new Map();
+
+// browser.cloudFile.onAccountAdded.addListener(async (account) => {
+//   //console.log("Account Added", account.id)
+// })
+
+async function getAccountInfo(accountId) {
+  let accountInfo = await browser.storage.local.get([accountId]);
+  if (!accountInfo[accountId] || !("webdavUrl" in accountInfo[accountId])) {
+    throw new Error("No Accounts found.");
+  }
+  return accountInfo[accountId];
+}
+
+browser.cloudFile.onFileUpload.addListener(async (account, params) => {
+
+  let { id, name, data } = params;
+
+  name = "" + Date.now() + "_" + name;
+
+  console.log("onFileUpload", id, account, name);
+
+  let accountInfo = await getAccountInfo(account.id);
+
+  //console.log("accountInfo", accountInfo);
+
+  let uploadInfo = {
+    id,
+    name,
+    abortController: new AbortController(),
+  };
+
+  uploads.set(id, uploadInfo);
+
+  let {webdavUrl, username, token, path} = accountInfo;
+
+  const authHeader = "Basic " + btoa(username + ":" + token);
+
+  let url = webdavUrl + path + encodeURIComponent(name);
+
+  let headers = {
+    "Content-Type": "application/octet-stream",
+    Authorization: authHeader
+  };
+  let fetchInfo = {
+    method: "PUT",
+    headers,
+    body: data,
+    signal: uploadInfo.abortController.signal,
+  };
+
+  //console.log("uploading to ", url, fetchInfo);
+
+  let response = await fetch(url, fetchInfo);
+
+  //console.log("file upload response", response);
+
+  delete uploadInfo.abortController;
+  if (response.status > 299) {
+    throw new Error("response was not ok: server status code: " + response.status + ", response message: " + response.statusText);
+  }
+
+  const serverUrl = webdavUrl.substr(0, webdavUrl.indexOf("remote.php"));
+  const shareUrl = serverUrl + "ocs/v1.php/apps/files_sharing/api/v1/shares?format=json";
+
+  uploadInfo.abortController = new AbortController();
+  uploads.set(id, uploadInfo);
+  
+  headers = {
+    "Content-Type": "application/x-www-form-urlencoded; charset=utf-8",
+    Authorization: authHeader,
+    "OCS-APIRequest": true
+  };
+
+  fetchInfo = {
+    method: "POST",
+    headers,
+    body: "shareType=3&path=" + encodeURIComponent(path + name),
+    signal: uploadInfo.abortController.signal,
+  };
+
+  console.log("requesting public link", shareUrl, fetchInfo);
+
+  response = await fetch(shareUrl, fetchInfo);
+
+  //console.log("public link response", response);
+
+  if(response.ok)
+  {
+    let respJson = await response.json();
+
+    uploadInfo.shareID = respJson.ocs.data.id;
+    uploads.set(id, uploadInfo);
+
+    return {url: respJson.ocs.data.url + "/download"};
+  }
+  else
+    return {aborted: true}
+
+});
+
+browser.cloudFile.onFileUploadAbort.addListener((account, id) => {
+  //console.log("aborting upload", id);
+  let uploadInfo = uploads.get(id);
+  if (uploadInfo && uploadInfo.abortController) {
+    uploadInfo.abortController.abort();
+  }
+});
+
+browser.cloudFile.onFileDeleted.addListener(async (account, id) => {
+  //console.log("delete upload", id);
+  let uploadInfo = uploads.get(id);
+  if (!uploadInfo) {
+    return;
+  }
+
+  // FIXME how do we get a confirmation popup in TB MailExtensions?
+  // let wishDelete = confirm("Do you wish to delete the file on the server?");
+  // if(!wishDelete){
+  //   return;
+  // }
+
+  let accountInfo = await getAccountInfo(account.id);
+
+  let {shareID} = uploadInfo;
+  let {webdavUrl, username, token} = accountInfo;
+
+  const authHeader = "Basic " + btoa(username + ":" + token);
+
+  const serverUrl = webdavUrl.substr(0, webdavUrl.indexOf("remote.php"));
+  const shareUrl = serverUrl + "ocs/v1.php/apps/files_sharing/api/v1/shares/" + shareID;
+
+  let headers = {
+    Authorization: authHeader,
+    "OCS-APIRequest": true
+  };
+
+  let fetchInfo = {
+    headers,
+    method: "DELETE",
+  };
+
+  //console.log("sending delete", url, fetchInfo);
+
+  let response = await fetch(shareUrl, fetchInfo);
+
+  //console.log("delete response", response);
+
+  uploads.delete(id);
+  
+  if (response.status > 299) {
+    throw new Error("response was not ok: server status code: " + response.status + ", response message: " + response.statusText);
+  }
+
+});
+
+browser.cloudFile.getAllAccounts().then(async (accounts) => {
+  let allAccountsInfo = await browser.storage.local.get();
+  for (let account of accounts) {
+    await browser.cloudFile.updateAccount(account.id, {
+      configured: account.id in allAccountsInfo,
+    });
+  }
+});