MOBILE-2272 quiz: Support add new files in essay in offline

src/addon/mod/quiz/providers/quiz-sync.ts

@@ -78,25 +78,33 @@ export class AddonModQuizSyncProvider extends CoreCourseActivitySyncBaseProvider
      * @param quiz Quiz.
      * @param courseId Course ID.
      * @param warnings List of warnings generated by the sync.
-     * @param attemptId Last attempt ID.
+     * @param options Other options.
-     * @param offlineAttempt Offline attempt synchronized, if any.
-     * @param onlineAttempt Online data for the offline attempt.
-     * @param removeAttempt Whether the offline data should be removed.
-     * @param updated Whether some data was sent to the site.
      * @return Promise resolved on success.
      */
-    protected finishSync(siteId: string, quiz: any, courseId: number, warnings: string[], attemptId?: number, offlineAttempt?: any,
+    protected finishSync(siteId: string, quiz: any, courseId: number, warnings: string[], options?: FinishSyncOptions)
-            onlineAttempt?: any, removeAttempt?: boolean, updated?: boolean): Promise<AddonModQuizSyncResult> {
+            : Promise<AddonModQuizSyncResult> {
+        options = options || {};
 
         // Invalidate the data for the quiz and attempt.
-        return this.quizProvider.invalidateAllQuizData(quiz.id, courseId, attemptId, siteId).catch(() => {
+        return this.quizProvider.invalidateAllQuizData(quiz.id, courseId, options.attemptId, siteId).catch(() => {
             // Ignore errors.
         }).then(() => {
-            if (removeAttempt && attemptId) {
+            if (options.removeAttempt && options.attemptId) {
-                return this.quizOfflineProvider.removeAttemptAndAnswers(attemptId, siteId);
+                const promises = [];
+
+                promises.push(this.quizOfflineProvider.removeAttemptAndAnswers(options.attemptId, siteId));
+
+                if (options.onlineQuestions) {
+                    for (const slot in options.onlineQuestions) {
+                        promises.push(this.questionDelegate.deleteOfflineData(options.onlineQuestions[slot],
+                                AddonModQuizProvider.COMPONENT, quiz.coursemodule, siteId));
+                    }
+                }
+
+                return Promise.all(promises);
             }
         }).then(() => {
-            if (updated) {
+            if (options.updated) {
                 // Data has been sent. Update prefetched data.
                 return this.courseProvider.getModuleBasicInfoByInstance(quiz.id, 'quiz', siteId).then((module) => {
                     return this.prefetchAfterUpdateQuiz(module, quiz, courseId, undefined, siteId);
@@ -110,14 +118,14 @@ export class AddonModQuizSyncProvider extends CoreCourseActivitySyncBaseProvider
             });
         }).then(() => {
             // Check if online attempt was finished because of the sync.
-            if (onlineAttempt && !this.quizProvider.isAttemptFinished(onlineAttempt.state)) {
+            if (options.onlineAttempt && !this.quizProvider.isAttemptFinished(options.onlineAttempt.state)) {
                 // Attempt wasn't finished at start. Check if it's finished now.
                 return this.quizProvider.getUserAttempts(quiz.id, {cmId: quiz.coursemodule, siteId}).then((attempts) => {
                     // Search the attempt.
                     for (const i in attempts) {
                         const attempt = attempts[i];
 
-                        if (attempt.id == onlineAttempt.id) {
+                        if (attempt.id == options.onlineAttempt.id) {
                             return this.quizProvider.isAttemptFinished(attempt.state);
                         }
                     }
@@ -355,7 +363,12 @@ export class AddonModQuizSyncProvider extends CoreCourseActivitySyncBaseProvider
             // Attempt not found or it's finished in online. Discard it.
             warnings.push(this.translate.instant('addon.mod_quiz.warningattemptfinished'));
 
-            return this.finishSync(siteId, quiz, courseId, warnings, offlineAttempt.id, offlineAttempt, onlineAttempt, true);
+            return this.finishSync(siteId, quiz, courseId, warnings, {
+                attemptId: offlineAttempt.id,
+                offlineAttempt,
+                onlineAttempt,
+                removeAttempt: true,
+            });
         }
 
         // Get the data stored in offline.
@@ -363,7 +376,12 @@ export class AddonModQuizSyncProvider extends CoreCourseActivitySyncBaseProvider
 
         if (!answersList.length) {
             // No answers stored, finish.
-            return this.finishSync(siteId, quiz, courseId, warnings, lastAttemptId, offlineAttempt, onlineAttempt, true);
+            return this.finishSync(siteId, quiz, courseId, warnings, {
+                attemptId: lastAttemptId,
+                offlineAttempt,
+                onlineAttempt,
+                removeAttempt: true,
+            });
         }
 
         const offlineAnswers = this.questionProvider.convertAnswersArrayToObject(answersList);
@@ -376,10 +394,8 @@ export class AddonModQuizSyncProvider extends CoreCourseActivitySyncBaseProvider
                     'core.settings.synchronization', siteId);
 
         // Now get the online questions data.
-        const pages = this.quizProvider.getPagesFromLayoutAndQuestions(onlineAttempt.layout, offlineQuestions);
-
         const onlineQuestions = await this.quizProvider.getAllQuestionsData(quiz, onlineAttempt, preflightData, {
-            pages,
+            pages: this.quizProvider.getPagesFromLayoutAndQuestions(onlineAttempt.layout, offlineQuestions),
             readingStrategy: CoreSitesReadingStrategy.OnlyNetwork,
             siteId,
         });
@@ -387,6 +403,14 @@ export class AddonModQuizSyncProvider extends CoreCourseActivitySyncBaseProvider
         // Validate questions, discarding the offline answers that can't be synchronized.
         const discardedData = await this.validateQuestions(onlineAttempt.id, onlineQuestions, offlineQuestions, siteId);
 
+        // Let questions prepare the data to send.
+        await Promise.all(Object.keys(offlineQuestions).map(async (slot) => {
+            const onlineQuestion = onlineQuestions[slot];
+
+            await this.questionDelegate.prepareSyncData(onlineQuestion, offlineQuestions[slot].answers,
+                    AddonModQuizProvider.COMPONENT, quiz.coursemodule, siteId);
+        }));
+
         // Get the answers to send.
         const answers = this.quizOfflineProvider.extractAnswersFromQuestions(offlineQuestions);
         const finish = offlineAttempt.finished && !discardedData;
@@ -410,7 +434,14 @@ export class AddonModQuizSyncProvider extends CoreCourseActivitySyncBaseProvider
         }
 
         // Data sent. Finish the sync.
-        return this.finishSync(siteId, quiz, courseId, warnings, lastAttemptId, offlineAttempt, onlineAttempt, true, true);
+        return this.finishSync(siteId, quiz, courseId, warnings, {
+            attemptId: lastAttemptId,
+            offlineAttempt,
+            onlineAttempt,
+            removeAttempt: true,
+            updated: true,
+            onlineQuestions,
+        });
     }
 
     /**
@@ -458,3 +489,15 @@ export class AddonModQuizSyncProvider extends CoreCourseActivitySyncBaseProvider
         });
     }
 }
+
+/**
+ * Options to pass to finish sync.
+ */
+type FinishSyncOptions = {
+    attemptId?: number; // Last attempt ID.
+    offlineAttempt?: any; // Offline attempt synchronized, if any.
+    onlineAttempt?: any; // Online data for the offline attempt.
+    removeAttempt?: boolean; // Whether the offline data should be removed.
+    updated?: boolean; // Whether the offline data should be removed.
+    onlineQuestions?: any; // Online questions indexed by slot.
+};

src/addon/qtype/essay/component/addon-qtype-essay.html

@@ -27,7 +27,7 @@
 
     <!-- Attachments. -->
     <ng-container *ngIf="question.allowsAttachments">
-        <core-attachments *ngIf="uploadFilesSupported" [files]="attachments" [component]="component" [componentId]="componentId" [maxSize]="question.attachmentsMaxBytes" [maxSubmissions]="question.attachmentsMaxFiles" [allowOffline]="offline"></core-attachments>
+        <core-attachments *ngIf="uploadFilesSupported" [files]="attachments" [component]="component" [componentId]="componentId" [maxSize]="question.attachmentsMaxBytes" [maxSubmissions]="question.attachmentsMaxFiles" [allowOffline]="offlineEnabled"></core-attachments>
 
         <input item-content *ngIf="uploadFilesSupported" type="hidden" [name]="question.attachmentsDraftIdInput.name" [value]="question.attachmentsDraftIdInput.value" >
 

src/addon/qtype/essay/component/essay.ts

@@ -15,6 +15,7 @@
 import { Component, OnInit, Injector } from '@angular/core';
 import { CoreLoggerProvider } from '@providers/logger';
 import { CoreWSExternalFile } from '@providers/ws';
+import { CoreFileUploader } from '@core/fileuploader/providers/fileuploader';
 import { CoreQuestionBaseComponent } from '@core/question/classes/base-question-component';
 import { CoreQuestion } from '@core/question/providers/question';
 import { FormControl, FormBuilder } from '@angular/forms';
@@ -48,9 +49,33 @@ export class AddonQtypeEssayComponent extends CoreQuestionBaseComponent implemen
         this.formControl = this.fb.control(this.question.textarea && this.question.textarea.text);
 
         if (this.question.allowsAttachments && this.uploadFilesSupported) {
-            this.attachments = Array.from(this.questionHelper.getResponseFileAreaFiles(this.question, 'attachments'));
+            this.loadAttachments();
-            CoreFileSession.instance.setFiles(this.component,
-                    CoreQuestion.instance.getQuestionComponentId(this.question, this.componentId), this.attachments);
         }
     }
+
+    /**
+     * Load attachments.
+     *
+     * @return Promise resolved when done.
+     */
+    async loadAttachments(): Promise<void> {
+        if (this.offlineEnabled && this.question.localAnswers['attachments_offline']) {
+
+            const attachmentsData = this.textUtils.parseJSON(this.question.localAnswers['attachments_offline'], {});
+            let offlineFiles = [];
+
+            if (attachmentsData.offline) {
+                offlineFiles = await this.questionHelper.getStoredQuestionFiles(this.question, this.component, this.componentId);
+
+                offlineFiles = CoreFileUploader.instance.markOfflineFiles(offlineFiles);
+            }
+
+            this.attachments = (attachmentsData.online || []).concat(offlineFiles);
+        } else {
+            this.attachments = Array.from(this.questionHelper.getResponseFileAreaFiles(this.question, 'attachments'));
+        }
+
+        CoreFileSession.instance.setFiles(this.component,
+                CoreQuestion.instance.getQuestionComponentId(this.question, this.componentId), this.attachments);
+    }
 }

src/addon/qtype/essay/providers/handler.ts

@@ -54,6 +54,19 @@ export class AddonQtypeEssayHandler implements CoreQuestionHandler {
         CoreFileUploader.instance.clearTmpFiles(files);
     }
 
+    /**
+     * Delete any stored data for the question.
+     *
+     * @param question Question.
+     * @param component The component the question is related to.
+     * @param componentId Component ID.
+     * @param siteId Site ID. If not defined, current site.
+     * @return Promise resolved when done.
+     */
+    deleteOfflineData(question: any, component: string, componentId: string | number, siteId?: string): Promise<void> {
+        return this.questionHelper.deleteStoredQuestionFiles(question, component, componentId, siteId);
+    }
+
     /**
      * Return the name of the behaviour to use for the question.
      * If the question should use the default behaviour you shouldn't implement this function.
@@ -186,11 +199,11 @@ export class AddonQtypeEssayHandler implements CoreQuestionHandler {
         const attachments = CoreFileSession.instance.getFiles(component, questionComponentId);
         const originalAttachments = this.questionHelper.getResponseFileAreaFiles(question, 'attachments');
 
-        return CoreFileUploader.instance.areFileListDifferent(attachments, originalAttachments);
+        return !CoreFileUploader.instance.areFileListDifferent(attachments, originalAttachments);
     }
 
     /**
-     * Prepare and add to answers the data to send to server based in the input. Return promise if async.
+     * Prepare and add to answers the data to send to server based in the input.
      *
      * @param question Question.
      * @param answers The answers retrieved from the form. Prepared answers must be stored in this object.
@@ -210,29 +223,103 @@ export class AddonQtypeEssayHandler implements CoreQuestionHandler {
         const textarea = <HTMLTextAreaElement> element.querySelector('textarea[name*=_answer]');
 
         if (textarea && typeof answers[textarea.name] != 'undefined') {
-            if (this.questionHelper.hasDraftFileUrls(question.html) && question.responsefileareas) {
+            await this.prepareTextAnswer(question, answers, textarea, siteId);
-                // Restore draftfile URLs.
-                const site = await CoreSites.instance.getSite(siteId);
-
-                answers[textarea.name] = this.textUtils.restoreDraftfileUrls(site.getURL(), answers[textarea.name],
-                        question.html, this.questionHelper.getResponseFileAreaFiles(question, 'answer'));
-            }
-
-            // Add some HTML to the text if needed.
-            answers[textarea.name] = this.textUtils.formatHtmlLines(answers[textarea.name]);
         }
 
         if (attachmentsInput) {
-            // Treat attachments if any.
+            await this.prepareAttachments(question, answers, offline, component, componentId, attachmentsInput, siteId);
-            const questionComponentId = CoreQuestion.instance.getQuestionComponentId(question, componentId);
-            const attachments = CoreFileSession.instance.getFiles(component, questionComponentId);
-            const draftId = Number(attachmentsInput.value);
-
-            if (offline) {
-                // @TODO Support offline.
-            } else {
-                await CoreFileUploader.instance.uploadFiles(draftId, attachments, siteId);
-            }
         }
     }
+
+    /**
+     * Prepare attachments.
+     *
+     * @param question Question.
+     * @param answers The answers retrieved from the form. Prepared answers must be stored in this object.
+     * @param offline Whether the data should be saved in offline.
+     * @param component The component the question is related to.
+     * @param componentId Component ID.
+     * @param attachmentsInput The HTML input containing the draft ID for attachments.
+     * @param siteId Site ID. If not defined, current site.
+     * @return Return a promise resolved when done if async, void if sync.
+     */
+    async prepareAttachments(question: any, answers: any, offline: boolean, component: string, componentId: string | number,
+            attachmentsInput: HTMLInputElement, siteId?: string): Promise<void> {
+
+        // Treat attachments if any.
+        const questionComponentId = CoreQuestion.instance.getQuestionComponentId(question, componentId);
+        const attachments = CoreFileSession.instance.getFiles(component, questionComponentId);
+        const draftId = Number(attachmentsInput.value);
+
+        if (offline) {
+            // Get the folder where to store the files.
+            const folderPath = CoreQuestion.instance.getQuestionFolder(question.type, component, questionComponentId, siteId);
+
+            const result = await CoreFileUploader.instance.storeFilesToUpload(folderPath, attachments);
+
+            // Store the files in the answers.
+            answers[attachmentsInput.name + '_offline'] = JSON.stringify(result);
+        } else {
+            await CoreFileUploader.instance.uploadFiles(draftId, attachments, siteId);
+        }
+    }
+
+    /**
+     * Prepare data to send when performing a synchronization.
+     *
+     * @param question Question.
+     * @param answers Answers of the question, without the prefix.
+     * @param component The component the question is related to.
+     * @param componentId Component ID.
+     * @param siteId Site ID. If not defined, current site.
+     * @return Promise resolved when done.
+     */
+    async prepareSyncData(question: any, answers: {[name: string]: any}, component: string, componentId: string | number,
+            siteId?: string): Promise<void> {
+
+        const element = this.domUtils.convertToElement(question.html);
+        const attachmentsInput = <HTMLInputElement> element.querySelector('.attachments input[name*=_attachments]');
+
+        if (attachmentsInput) {
+            // Update the draft ID, the stored one could no longer be valid.
+            answers.attachments = attachmentsInput.value;
+        }
+
+        if (answers && answers.attachments_offline) {
+            // Check if it has new attachments to upload.
+            const attachmentsData = this.textUtils.parseJSON(answers.attachments_offline, {});
+
+            if (attachmentsData.offline) {
+                // Upload the offline files.
+                const offlineFiles = await this.questionHelper.getStoredQuestionFiles(question, component, componentId, siteId);
+
+                await CoreFileUploader.instance.uploadFiles(answers.attachments, attachmentsData.online.concat(offlineFiles),
+                        siteId);
+            }
+
+            delete answers.attachments_offline;
+        }
+    }
+
+    /**
+     * Prepare the text answer.
+     *
+     * @param question Question.
+     * @param answers The answers retrieved from the form. Prepared answers must be stored in this object.
+     * @param textarea The textarea HTML element of the question.
+     * @param siteId Site ID. If not defined, current site.
+     * @return Promise resolved when done.
+     */
+    async prepareTextAnswer(question: any, answers: any, textarea: HTMLTextAreaElement, siteId?: string): Promise<void> {
+        if (this.questionHelper.hasDraftFileUrls(question.html) && question.responsefileareas) {
+            // Restore draftfile URLs.
+            const site = await CoreSites.instance.getSite(siteId);
+
+            answers[textarea.name] = this.textUtils.restoreDraftfileUrls(site.getURL(), answers[textarea.name],
+                    question.html, this.questionHelper.getResponseFileAreaFiles(question, 'answer'));
+        }
+
+        // Add some HTML to the text if needed.
+        answers[textarea.name] = this.textUtils.formatHtmlLines(answers[textarea.name]);
+    }
 }

src/core/fileuploader/providers/fileuploader.ts

@@ -552,16 +552,26 @@ export class CoreFileUploaderProvider {
             return;
         }
 
-        await Promise.all(files.map(async (file) => {
+        // Index the online files by name.
-            if ((<CoreWSExternalFile> file).filename && !(<FileEntry> file).name) {
+        const usedNames: {[name: string]: (CoreWSExternalFile | FileEntry)} = {};
-                // File already uploaded, ignore it.
+        const filesToUpload: FileEntry[] = [];
-                return;
+        files.forEach((file) => {
-            }
+            const isOnlineFile = (<CoreWSExternalFile> file).filename && !(<FileEntry> file).name;
 
-            file = <FileEntry> file;
+            if (isOnlineFile) {
+                usedNames[(<CoreWSExternalFile> file).filename.toLowerCase()] = file;
+            } else {
+                filesToUpload.push(<FileEntry> file);
+            }
+        });
+
+        await Promise.all(filesToUpload.map(async (file) => {
+            // Make sure the file name is unique in the area.
+            const name = this.fileProvider.calculateUniqueName(usedNames, file.name);
+            usedNames[name] = file;
 
             // Now upload the file.
-            const options = this.getFileUploadOptions(file.toURL(), file.name, undefined, false, 'draft', itemId);
+            const options = this.getFileUploadOptions(file.toURL(), name, undefined, false, 'draft', itemId);
 
             await this.uploadFile(file.toURL(), options, undefined, siteId);
         }));

src/core/question/providers/delegate.ts

@@ -127,8 +127,33 @@ export interface CoreQuestionHandler extends CoreDelegateHandler {
      * @param question Question.
      * @param component The component the question is related to.
      * @param componentId Component ID.
+     * @return If async, promise resolved when done.
      */
     clearTmpData?(question: any, component: string, componentId: string | number): void | Promise<void>;
+
+    /**
+     * Delete any stored data for the question.
+     *
+     * @param question Question.
+     * @param component The component the question is related to.
+     * @param componentId Component ID.
+     * @param siteId Site ID. If not defined, current site.
+     * @return If async, promise resolved when done.
+     */
+    deleteOfflineData?(question: any, component: string, componentId: string | number, siteId?: string): void | Promise<void>;
+
+    /**
+     * Prepare data to send when performing a synchronization.
+     *
+     * @param question Question.
+     * @param answers Answers of the question, without the prefix.
+     * @param component The component the question is related to.
+     * @param componentId Component ID.
+     * @param siteId Site ID. If not defined, current site.
+     * @return If async, promise resolved when done.
+     */
+    prepareSyncData?(question: any, answers: {[name: string]: any}, component: string, componentId: string | number,
+            siteId?: string): void | Promise<void>;
 }
 
 /**
@@ -309,10 +334,43 @@ export class CoreQuestionDelegate extends CoreDelegate {
      * @param question Question.
      * @param component The component the question is related to.
      * @param componentId Component ID.
+     * @return If async, promise resolved when done.
      */
     clearTmpData(question: any, component: string, componentId: string | number): void | Promise<void> {
         const type = this.getTypeName(question);
 
         return this.executeFunctionOnEnabled(type, 'clearTmpData', [question, component, componentId]);
     }
+
+    /**
+     * Clear temporary data after the data has been saved.
+     *
+     * @param question Question.
+     * @param component The component the question is related to.
+     * @param componentId Component ID.
+     * @param siteId Site ID. If not defined, current site.
+     * @return If async, promise resolved when done.
+     */
+    deleteOfflineData(question: any, component: string, componentId: string | number, siteId?: string): void | Promise<void> {
+        const type = this.getTypeName(question);
+
+        return this.executeFunctionOnEnabled(type, 'deleteOfflineData', [question, component, componentId, siteId]);
+    }
+
+    /**
+     * Prepare data to send when performing a synchronization.
+     *
+     * @param question Question.
+     * @param answers Answers of the question, without the prefix.
+     * @param component The component the question is related to.
+     * @param componentId Component ID.
+     * @param siteId Site ID. If not defined, current site.
+     * @return If async, promise resolved when done.
+     */
+    prepareSyncData?(question: any, answers: {[name: string]: any}, component: string, componentId: string | number,
+            siteId?: string): void | Promise<void> {
+        const type = this.getTypeName(question);
+
+        return this.executeFunctionOnEnabled(type, 'prepareSyncData', [question, answers, component, componentId, siteId]);
+    }
 }

src/core/question/providers/helper.ts

@@ -13,7 +13,9 @@
 // limitations under the License.
 
 import { Injectable, EventEmitter } from '@angular/core';
+import { FileEntry } from '@ionic-native/file';
 import { TranslateService } from '@ngx-translate/core';
+import { CoreFile } from '@providers/file';
 import { CoreFilepoolProvider } from '@providers/filepool';
 import { CoreSitesProvider } from '@providers/sites';
 import { CoreWSExternalFile } from '@providers/ws';
@@ -76,6 +78,25 @@ export class CoreQuestionHelperProvider {
         }));
     }
 
+    /**
+     * Delete files stored for a question.
+     *
+     * @param question Question.
+     * @param component The component the question is related to.
+     * @param componentId Component ID.
+     * @param siteId Site ID. If not defined, current site.
+     * @return Promise resolved when done.
+     */
+    async deleteStoredQuestionFiles(question: any, component: string, componentId: string | number, siteId?: string)
+            : Promise<void> {
+
+        const questionComponentId = this.questionProvider.getQuestionComponentId(question, componentId);
+        const folderPath = this.questionProvider.getQuestionFolder(question.type, component, questionComponentId, siteId);
+
+        // Ignore errors, maybe the folder doesn't exist.
+        await this.utils.ignoreErrors(CoreFile.instance.removeDir(folderPath));
+    }
+
     /**
      * Extract question behaviour submit buttons from the question's HTML and add them to "behaviourButtons" property.
      * The buttons aren't deleted from the content because all the im-controls block will be removed afterwards.
@@ -457,6 +478,22 @@ export class CoreQuestionHelperProvider {
         return area && area.files || [];
     }
 
+    /**
+     * Get files stored for a question.
+     *
+     * @param question Question.
+     * @param component The component the question is related to.
+     * @param componentId Component ID.
+     * @param siteId Site ID. If not defined, current site.
+     * @return Promise resolved with the files.
+     */
+    getStoredQuestionFiles(question: any, component: string, componentId: string | number, siteId?: string): Promise<FileEntry[]> {
+        const questionComponentId = this.questionProvider.getQuestionComponentId(question, componentId);
+        const folderPath = this.questionProvider.getQuestionFolder(question.type, component, questionComponentId, siteId);
+
+        return CoreFile.instance.getDirectoryContents(folderPath);
+    }
+
     /**
      * Get the validation error message from a question HTML if it's there.
      *

src/providers/file.ts

@@ -1114,10 +1114,8 @@ export class CoreFileProvider {
         // Get existing files in the folder.
         return this.getDirectoryContents(dirPath).then((entries) => {
             const files = {};
-            let num = 1,
+            let fileNameWithoutExtension = this.mimeUtils.removeExtension(fileName);
-                fileNameWithoutExtension = this.mimeUtils.removeExtension(fileName),
+            let extension = this.mimeUtils.getFileExtension(fileName) || defaultExt;
-                extension = this.mimeUtils.getFileExtension(fileName) || defaultExt,
-                newName;
 
             // Clean the file name.
             fileNameWithoutExtension = this.textUtils.removeSpecialCharactersForFiles(
@@ -1135,26 +1133,40 @@ export class CoreFileProvider {
                 extension = '';
             }
 
-            newName = fileNameWithoutExtension + extension;
+            return this.calculateUniqueName(files, fileNameWithoutExtension + extension);
-            if (typeof files[newName.toLowerCase()] == 'undefined') {
-                // No file with the same name.
-                return newName;
-            } else {
-                // Repeated name. Add a number until we find a free name.
-                do {
-                    newName = fileNameWithoutExtension + '(' + num + ')' + extension;
-                    num++;
-                } while (typeof files[newName.toLowerCase()] != 'undefined');
-
-                // Ask the user what he wants to do.
-                return newName;
-            }
         }).catch(() => {
             // Folder doesn't exist, name is unique. Clean it and return it.
             return this.textUtils.removeSpecialCharactersForFiles(this.textUtils.decodeURIComponent(fileName));
         });
     }
 
+    /**
+     * Given a file name and a set of already used names, calculate a unique name.
+     *
+     * @param usedNames Object with names already used as keys.
+     * @param name Name to check.
+     * @return Unique name.
+     */
+    calculateUniqueName(usedNames: {[name: string]: any}, name: string): string {
+        if (typeof usedNames[name.toLowerCase()] == 'undefined') {
+            // No file with the same name.
+            return name;
+        } else {
+            // Repeated name. Add a number until we find a free name.
+            const nameWithoutExtension = this.mimeUtils.removeExtension(name);
+            let extension = this.mimeUtils.getFileExtension(name);
+            let num = 1;
+            extension = extension ? '.' + extension : '';
+
+            do {
+                name = nameWithoutExtension + '(' + num + ')' + extension;
+                num++;
+            } while (typeof usedNames[name.toLowerCase()] != 'undefined');
+
+            return name;
+        }
+    }
+
     /**
      * Remove app temporary folder.
      *