Move Avatar component to jslib (#496)

angular/src/components/avatar.component.ts

@@ -0,0 +1,138 @@
+import {
+    Component,
+    Input,
+    OnChanges,
+    OnInit,
+} from '@angular/core';
+import { DomSanitizer } from '@angular/platform-browser';
+
+import { CryptoFunctionService } from 'jslib-common/abstractions/cryptoFunction.service';
+import { StateService } from 'jslib-common/abstractions/state.service';
+
+import { Utils } from 'jslib-common/misc/utils';
+
+@Component({
+    selector: 'app-avatar',
+    template: '<img [src]="sanitizer.bypassSecurityTrustResourceUrl(src)" title="{{data}}" ' +
+        '[ngClass]="{\'rounded-circle\': circle}">',
+})
+export class AvatarComponent implements OnChanges, OnInit {
+    @Input() data: string;
+    @Input() email: string;
+    @Input() size = 45;
+    @Input() charCount = 2;
+    @Input() textColor = '#ffffff';
+    @Input() fontSize = 20;
+    @Input() fontWeight = 300;
+    @Input() dynamic = false;
+    @Input() circle = false;
+
+    src: string;
+
+    constructor(public sanitizer: DomSanitizer, private cryptoFunctionService: CryptoFunctionService,
+        private stateService: StateService) { }
+
+    ngOnInit() {
+        if (!this.dynamic) {
+            this.generate();
+        }
+    }
+
+    ngOnChanges() {
+        if (this.dynamic) {
+            this.generate();
+        }
+    }
+
+    private async generate() {
+        const enableGravatars = await this.stateService.get<boolean>('enableGravatars');
+        if (enableGravatars && this.email != null) {
+            const hashBytes = await this.cryptoFunctionService.hash(this.email.toLowerCase().trim(), 'md5');
+            const hash = Utils.fromBufferToHex(hashBytes).toLowerCase();
+            this.src = 'https://www.gravatar.com/avatar/' + hash + '?s=' + this.size + '&r=pg&d=retro';
+        } else {
+            let chars: string = null;
+            const upperData = this.data.toUpperCase();
+
+            if (this.charCount > 1) {
+                chars = this.getFirstLetters(upperData, this.charCount);
+            }
+            if (chars == null) {
+                chars = this.unicodeSafeSubstring(upperData, this.charCount);
+            }
+
+            // If the chars contain an emoji, only show it.
+            if (chars.match(Utils.regexpEmojiPresentation)) {
+                chars = chars.match(Utils.regexpEmojiPresentation)[0];
+            }
+
+            const charObj = this.getCharText(chars);
+            const color = this.stringToColor(upperData);
+            const svg = this.getSvg(this.size, color);
+            svg.appendChild(charObj);
+            const html = window.document.createElement('div').appendChild(svg).outerHTML;
+            const svgHtml = window.btoa(unescape(encodeURIComponent(html)));
+            this.src = 'data:image/svg+xml;base64,' + svgHtml;
+        }
+    }
+
+    private stringToColor(str: string): string {
+        let hash = 0;
+        for (let i = 0; i < str.length; i++) {
+            // tslint:disable-next-line
+            hash = str.charCodeAt(i) + ((hash << 5) - hash);
+        }
+        let color = '#';
+        for (let i = 0; i < 3; i++) {
+            // tslint:disable-next-line
+            const value = (hash >> (i * 8)) & 0xFF;
+            color += ('00' + value.toString(16)).substr(-2);
+        }
+        return color;
+    }
+
+    private getFirstLetters(data: string, count: number): string {
+        const parts = data.split(' ');
+        if (parts.length > 1) {
+            let text = '';
+            for (let i = 0; i < count; i++) {
+                text += this.unicodeSafeSubstring(parts[i], 1);
+            }
+            return text;
+        }
+        return null;
+    }
+
+    private getSvg(size: number, color: string): HTMLElement {
+        const svgTag = window.document.createElement('svg');
+        svgTag.setAttribute('xmlns', 'http://www.w3.org/2000/svg');
+        svgTag.setAttribute('pointer-events', 'none');
+        svgTag.setAttribute('width', size.toString());
+        svgTag.setAttribute('height', size.toString());
+        svgTag.style.backgroundColor = color;
+        svgTag.style.width = size + 'px';
+        svgTag.style.height = size + 'px';
+        return svgTag;
+    }
+
+    private getCharText(character: string): HTMLElement {
+        const textTag = window.document.createElement('text');
+        textTag.setAttribute('text-anchor', 'middle');
+        textTag.setAttribute('y', '50%');
+        textTag.setAttribute('x', '50%');
+        textTag.setAttribute('dy', '0.35em');
+        textTag.setAttribute('pointer-events', 'auto');
+        textTag.setAttribute('fill', this.textColor);
+        textTag.setAttribute('font-family', '"Open Sans","Helvetica Neue",Helvetica,Arial,' +
+            'sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol"');
+        textTag.textContent = character;
+        textTag.style.fontWeight = this.fontWeight.toString();
+        textTag.style.fontSize = this.fontSize + 'px';
+        return textTag;
+    }
+
+    private unicodeSafeSubstring(str: string, count: number) {
+        const characters = str.match(/./ug);
+        return characters != null ? characters.slice(0, count).join('') : '';
+    }
+}