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joplin/ReactNativeClient/lib/models/Resource.js

143 lines
5.3 KiB
JavaScript

const BaseModel = require('lib/BaseModel.js');
const BaseItem = require('lib/models/BaseItem.js');
const Setting = require('lib/models/Setting.js');
const ArrayUtils = require('lib/ArrayUtils.js');
const pathUtils = require('lib/path-utils.js');
const { mime } = require('lib/mime-utils.js');
const { filename } = require('lib/path-utils.js');
const { FsDriverDummy } = require('lib/fs-driver-dummy.js');
const { markdownUtils } = require('lib/markdown-utils.js');
class Resource extends BaseItem {
static tableName() {
return 'resources';
}
static modelType() {
return BaseModel.TYPE_RESOURCE;
}
static encryptionService() {
if (!this.encryptionService_) throw new Error('Resource.encryptionService_ is not set!!');
return this.encryptionService_;
}
static isSupportedImageMimeType(type) {
const imageMimeTypes = ["image/jpg", "image/jpeg", "image/png", "image/gif"];
return imageMimeTypes.indexOf(type.toLowerCase()) >= 0;
}
static fsDriver() {
if (!Resource.fsDriver_) Resource.fsDriver_ = new FsDriverDummy();
return Resource.fsDriver_;
}
static async serialize(item, type = null, shownKeys = null) {
let fieldNames = this.fieldNames();
fieldNames.push('type_');
//fieldNames = ArrayUtils.removeElement(fieldNames, 'encryption_blob_encrypted');
return super.serialize(item, 'resource', fieldNames);
}
static filename(resource, encryptedBlob = false) {
let extension = encryptedBlob ? 'crypted' : resource.file_extension;
if (!extension) extension = resource.mime ? mime.toFileExtension(resource.mime) : '';
extension = extension ? ('.' + extension) : '';
return resource.id + extension;
}
static fullPath(resource, encryptedBlob = false) {
return Setting.value('resourceDir') + '/' + this.filename(resource, encryptedBlob);
}
// For resources, we need to decrypt the item (metadata) and the resource binary blob.
static async decrypt(item) {
// The item might already be decrypted but not the blob (for instance if it crashes while
// decrypting the blob or was otherwise interrupted).
const decryptedItem = item.encryption_cipher_text ? await super.decrypt(item) : Object.assign({}, item);
if (!decryptedItem.encryption_blob_encrypted) return decryptedItem;
const plainTextPath = this.fullPath(decryptedItem);
const encryptedPath = this.fullPath(decryptedItem, true);
const noExtPath = pathUtils.dirname(encryptedPath) + '/' + pathUtils.filename(encryptedPath);
// When the resource blob is downloaded by the synchroniser, it's initially a file with no
// extension (since it's encrypted, so we don't know its extension). So here rename it
// to a file with a ".crypted" extension so that it's better identified, and then decrypt it.
// Potentially plainTextPath is also a path with no extension if it's an unknown mime type.
if (await this.fsDriver().exists(noExtPath)) {
await this.fsDriver().move(noExtPath, encryptedPath);
}
await this.encryptionService().decryptFile(encryptedPath, plainTextPath);
decryptedItem.encryption_blob_encrypted = 0;
return super.save(decryptedItem, { autoTimestamp: false });
}
// Prepare the resource by encrypting it if needed.
// The call returns the path to the physical file AND a representation of the resource object
// as it should be uploaded to the sync target. Note that this may be different from what is stored
// in the database. In particular, the flag encryption_blob_encrypted might be 1 on the sync target
// if the resource is encrypted, but will be 0 locally because the device has the decrypted resource.
static async fullPathForSyncUpload(resource) {
const plainTextPath = this.fullPath(resource);
if (!Setting.value('encryption.enabled')) {
// Normally not possible since itemsThatNeedSync should only return decrypted items
if (!!resource.encryption_blob_encrypted) throw new Error('Trying to access encrypted resource but encryption is currently disabled');
return { path: plainTextPath, resource: resource };
}
const encryptedPath = this.fullPath(resource, true);
if (resource.encryption_blob_encrypted) return { path: encryptedPath, resource: resource };
await this.encryptionService().encryptFile(plainTextPath, encryptedPath);
const resourceCopy = Object.assign({}, resource);
resourceCopy.encryption_blob_encrypted = 1;
return { path: encryptedPath, resource: resourceCopy };
}
static markdownTag(resource) {
let tagAlt = resource.alt ? resource.alt : resource.title;
if (!tagAlt) tagAlt = '';
let lines = [];
if (Resource.isSupportedImageMimeType(resource.mime)) {
lines.push("![");
lines.push(markdownUtils.escapeLinkText(tagAlt));
lines.push("](:/" + resource.id + ")");
} else {
lines.push("[");
lines.push(markdownUtils.escapeLinkText(tagAlt));
lines.push("](:/" + resource.id + ")");
}
return lines.join('');
}
static pathToId(path) {
return filename(path);
}
static async content(resource) {
return this.fsDriver().readFile(this.fullPath(resource));
}
static setContent(resource, content) {
return this.fsDriver().writeBinaryFile(this.fullPath(resource), content);
}
static isResourceUrl(url) {
return url && url.length === 34 && url[0] === ':' && url[1] === '/';
}
static urlToId(url) {
if (!this.isResourceUrl(url)) throw new Error('Not a valid resource URL: ' + url);
return url.substr(2);
}
}
Resource.IMAGE_MAX_DIMENSION = 1920;
module.exports = Resource;