saving as CSV implemented (user list)

client/package.json

@@ -29,6 +29,7 @@
         "@ngx-translate/core": "^10.0.2",
         "@ngx-translate/http-loader": "^3.0.1",
         "core-js": "^2.5.4",
+        "file-saver": "^2.0.0-rc.3",
         "material-design-icons": "^3.0.1",
         "ngx-mat-select-search": "^1.4.0",
         "roboto-fontface": "^0.10.0",

client/src/app/app.component.ts

@@ -54,6 +54,7 @@ export class AppComponent {
      * TODO: Overloading can be extended to more functions.
      */
     private overloadArrayToString(): void {
+
         Array.prototype.toString = function(): string {
             let string = '';
             const iterations = Math.min(this.length, 3);

client/src/app/core/services/csv-export.service.spec.ts

@@ -0,0 +1,17 @@
+import { TestBed, inject } from '@angular/core/testing';
+
+import { CsvExportService } from './csv-export.service';
+import { E2EImportsModule } from '../../../e2e-imports.module';
+
+describe('CsvExportService', () => {
+    beforeEach(() => {
+        TestBed.configureTestingModule({
+            imports: [E2EImportsModule],
+            providers: [CsvExportService]
+        });
+    });
+
+    it('should be created', inject([CsvExportService], (service: CsvExportService) => {
+        expect(service).toBeTruthy();
+    }));
+});

client/src/app/core/services/csv-export.service.ts

@@ -0,0 +1,119 @@
+import { BaseViewModel } from '../../site/base/base-view-model';
+import { Injectable } from '@angular/core';
+import { FileExportService } from './file-export.service';
+import { TranslateService } from '@ngx-translate/core';
+
+@Injectable({
+    providedIn: 'root'
+})
+export class CsvExportService {
+    /**
+     * Constructor
+     */
+    public constructor(protected exporter: FileExportService, private translate: TranslateService) {}
+
+    /**
+     * Saves an array of model data to a CSV.
+     * @param data Array of Model instances to be saved
+     * @param columns Column definitions
+     * @param filename name of the resulting file
+     * @param options optional:
+     *      lineSeparator (defaults to \r\n windows style line separator),
+     *      columnseparator defaults to semicolon (other usual separators are ',' '\T' (tab), ' 'whitespace)
+     */
+    public export<T extends BaseViewModel>(
+        data: T[],
+        columns: {
+            property: keyof T; // name of the property used for export
+            label?: string;
+            assemble?: string; // (if property is further child object, the property of these to be used)
+        }[],
+        filename: string,
+        { lineSeparator = '\r\n', columnSeparator = ';' }: { lineSeparator?: string; columnSeparator?: string } = {}
+    ): void {
+        const allLines = []; // Array of arrays of entries
+        const usedColumns = []; // mapped properties to be included
+
+        // initial array of usable text separators. The first character not used
+        // in any text data or as column separator will be used as text separator
+        let tsList = ['"', "'", '`', '/', '\\', ';', '.'];
+
+        if (lineSeparator === columnSeparator) {
+            throw new Error('lineseparator and columnseparator must differ from each other');
+        }
+
+        tsList = this.checkCsvTextSafety(lineSeparator, tsList);
+        tsList = this.checkCsvTextSafety(columnSeparator, tsList);
+
+        // create header data
+        const header = [];
+        columns.forEach(column => {
+            const rawLabel: string = column.label ? column.label : (column.property as string);
+            const colLabel = this.capitalizeTranslate(rawLabel);
+            tsList = this.checkCsvTextSafety(colLabel, tsList);
+            header.push(colLabel);
+            usedColumns.push(column.property);
+        });
+        allLines.push(header);
+        // create lines
+        data.forEach(item => {
+            const line = [];
+            for (let i = 0; i < usedColumns.length; i++ ){
+                const property = usedColumns[i];
+                let prop: any = item[property];
+                if (columns[i].assemble){
+                    prop = item[property].map(subitem => this.translate.instant(subitem[columns[i].assemble])).join(',');
+                }
+                tsList = this.checkCsvTextSafety(prop, tsList);
+                line.push(prop);
+            };
+            allLines.push(line);
+        });
+
+        // assemble lines, putting text separator in place
+        if (!tsList.length) {
+            throw new Error('no usable text separator left for valid csv text');
+        }
+
+        const allLinesAssembled = [];
+        allLines.forEach(line => {
+            const assembledLine = [];
+            line.forEach(item => {
+                if (typeof item === 'number') {
+                    assembledLine.push(item.toString(10));
+                } else if (item === null || item === undefined || item === '') {
+                    assembledLine.push('');
+                } else if (item === true) {
+                    assembledLine.push('1');
+                } else if (item === false) {
+                    assembledLine.push('0');
+                } else {
+                    assembledLine.push(tsList[0] + item + tsList[0]);
+                }
+            });
+            allLinesAssembled.push(assembledLine.join(columnSeparator));
+        });
+        this.exporter.saveFile(allLinesAssembled.join(lineSeparator), filename);
+    }
+
+    /**
+     * Checks if a given input contains any of the characters defined in a list
+     * used for textseparators. The list is then returned without the 'special'
+     * characters, as they may not be used as text separator in this csv.
+     * @param input any input to be sent to CSV
+     * @param tsList The list of special characters to check.
+     */
+    public checkCsvTextSafety(input: any, tsList: string[]): string[] {
+        if (input === null || input === undefined ) {
+            return tsList;
+        }
+
+        const inputAsString = String(input);
+        return tsList.filter(char => inputAsString.indexOf(char) < 0);
+    }
+
+    private capitalizeTranslate(input: string): string {
+        const temp = input.charAt(0).toUpperCase() + input.slice(1);
+        return this.translate.instant(temp);
+    }
+}

client/src/app/core/services/file-export.service.spec.ts

@@ -0,0 +1,17 @@
+import { TestBed, inject } from '@angular/core/testing';
+
+import { FileExportService } from './file-export.service';
+import { E2EImportsModule } from '../../../e2e-imports.module';
+
+describe('FileExportService', () => {
+    beforeEach(() => {
+        TestBed.configureTestingModule({
+            imports: [E2EImportsModule],
+            providers: [FileExportService]
+        });
+    });
+
+    it('should be created', inject([FileExportService], (service: FileExportService) => {
+        expect(service).toBeTruthy();
+    }));
+});

client/src/app/core/services/file-export.service.ts

@@ -0,0 +1,33 @@
+import { Injectable } from '@angular/core';
+import { saveAs } from 'file-saver';
+
+@Injectable({
+    providedIn: 'root'
+})
+export class FileExportService {
+    /**
+     * Constructor
+     */
+    public constructor() {}
+
+    /**
+     * Saves a file
+     * @param file
+     * @param filename
+     */
+    public saveFile(file: BlobPart, filename: string): void {
+        const blob = new Blob([file]);
+        saveAs(blob, filename, { autoBOM: true });
+        // autoBOM = automatic byte-order-mark
+    }
+
+    /**
+     * Validates a file name for characters that might break.
+     * @param filename A name used to save a file
+     */
+    protected validateFileName(filename: string): boolean {
+        // everything not containing \/?%*:|"<> and not ending on a dot
+        const pattern = new RegExp(/^[^\\\/\?%\*:\|\"\<\>]*[^\.]+$/i);
+        return pattern.test(filename);
+    }
+}

client/src/app/site/users/components/user-list/user-list.component.html

@@ -75,8 +75,8 @@
         <span translate>Import ...</span>
     </button>
 
-    <button mat-menu-item>
+    <button mat-menu-item (click)="csvExportUserList()">
         <mat-icon>archive</mat-icon>
-        <span translate>Export ...</span>
+        <span translate>Export as csv</span>
     </button>
 </mat-menu>

client/src/app/site/users/components/user-list/user-list.component.ts

@@ -1,6 +1,7 @@
 import { Component, OnInit } from '@angular/core';
 import { Title } from '@angular/platform-browser';
 import { TranslateService } from '@ngx-translate/core';
+import { CsvExportService } from '../../../../core/services/csv-export.service';
 
 import { ViewUser } from '../../models/view-user';
 import { UserRepositoryService } from '../../services/user-repository.service';
@@ -17,6 +18,7 @@ import { Router, ActivatedRoute } from '@angular/router';
     styleUrls: ['./user-list.component.scss']
 })
 export class UserListComponent extends ListViewBaseComponent<ViewUser> implements OnInit {
+
     /**
      * The usual constructor for components
      * @param repo the user repository
@@ -28,7 +30,8 @@ export class UserListComponent extends ListViewBaseComponent<ViewUser> implement
         protected titleService: Title,
         protected translate: TranslateService,
         private router: Router,
-        private route: ActivatedRoute
+        private route: ActivatedRoute,
+        protected csvExport: CsvExportService
     ) {
         super(titleService, translate);
     }
@@ -69,4 +72,26 @@ export class UserListComponent extends ListViewBaseComponent<ViewUser> implement
     public onPlusButton(): void {
         this.router.navigate(['./new'], { relativeTo: this.route });
     }
+
+    // TODO save all data from the dataSource
+    public csvExportUserList(): void {
+        this.csvExport.export(
+            this.dataSource.data,
+            [
+                { property: 'title' },
+                { property: 'first_name', label: 'First Name' },
+                { property: 'last_name', label: 'Last Name' },
+                { property: 'structure_level', label: 'Structure Level' },
+                { property: 'participant_number', label: 'Participant Number' },
+                { property: 'groups', assemble: 'name'},
+                { property: 'comment' },
+                { property: 'is_active', label: 'Active' },
+                { property: 'is_present', label: 'Presence' },
+                { property: 'is_committee', label: 'Committee' },
+                { property: 'default_password', label: 'Default password' },
+                { property: 'email', label: 'E-Mail' }
+            ],
+            'export.csv'
+        );
+    }
 }