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199 changes: 199 additions & 0 deletions
199
projects/hslayers/shared/add-data/vector/vector-upload.service.ts
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| @@ -0,0 +1,199 @@ | ||
| import {Injectable} from '@angular/core'; | ||
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| import {Feature} from 'ol'; | ||
| import {Projection, get as getProjection} from 'ol/proj'; | ||
| import {PROJECTIONS as epsg4326Aliases} from 'ol/proj/epsg4326'; | ||
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|
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| import {HsLogService} from 'hslayers-ng/shared/log'; | ||
| import {HsMapService} from 'hslayers-ng/shared/map'; | ||
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| import {HsAddDataVectorUtilsService} from './vector.utils.service'; | ||
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| @Injectable({ | ||
| providedIn: 'root', | ||
| }) | ||
| export class HsAddDataVectorUploadService { | ||
| readUploadedFileAsText = (inputFile: any) => { | ||
| const temporaryFileReader = new FileReader(); | ||
| return new Promise((resolve, reject) => { | ||
| temporaryFileReader.onerror = () => { | ||
| temporaryFileReader.abort(); | ||
| reject(new DOMException('Problem parsing input file.')); | ||
| }; | ||
| temporaryFileReader.onload = () => { | ||
| resolve(temporaryFileReader.result); | ||
| }; | ||
| temporaryFileReader.readAsText(inputFile); | ||
| }); | ||
| }; | ||
| readUploadedFileAsURL = (inputFile: any) => { | ||
| const temporaryFileReader = new FileReader(); | ||
| return new Promise((resolve, reject) => { | ||
| temporaryFileReader.onerror = () => { | ||
| temporaryFileReader.abort(); | ||
| reject(new DOMException('Problem parsing input file.')); | ||
| }; | ||
| temporaryFileReader.onload = () => { | ||
| resolve(temporaryFileReader.result); | ||
| }; | ||
| temporaryFileReader.readAsDataURL(inputFile); | ||
| }); | ||
| }; | ||
|
|
||
| constructor( | ||
| private hsLog: HsLogService, | ||
| private hsMapService: HsMapService, | ||
| private hsAddDataVectorUtilsService: HsAddDataVectorUtilsService, | ||
| ) {} | ||
|
|
||
| /** | ||
| * Create a object containing data from XML dataset | ||
| * @param file - File uploaded by the user | ||
| * @param type - Data type | ||
| */ | ||
| async createVectorObjectFromXml(file: File, type: string): Promise<any> { | ||
| try { | ||
| const uploadedContent = await this.readUploadedFileAsURL(file); | ||
| const dataUrl = uploadedContent.toString(); | ||
| const object = { | ||
| url: dataUrl, | ||
| name: file.name, | ||
| title: file.name, | ||
| type: type, | ||
| }; | ||
| return object; | ||
| } catch (e) { | ||
| this.hsLog.warn('Uploaded file is not supported!'); | ||
| return {error: 'couldNotUploadSelectedFile'}; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Read uploaded file and extract the data as JSON object | ||
| * @param file - File uploaded by the user | ||
| * @returns JSON object with parsed data | ||
| */ | ||
| async readUploadedFile(file: File): Promise<any> { | ||
| let uploadedData; | ||
| const fileType = this.hsAddDataVectorUtilsService.tryGuessTypeFromNameOrUrl( | ||
| file.name.toLowerCase(), | ||
| ); | ||
| switch (fileType) { | ||
| case 'kml': | ||
| uploadedData = await this.createVectorObjectFromXml(file, fileType); | ||
| break; | ||
| case 'gpx': | ||
| uploadedData = await this.convertUploadedData(file); | ||
| break; | ||
| default: | ||
| try { | ||
| const fileContents = await this.readUploadedFileAsText(file); | ||
| const fileToJSON = JSON.parse(<string>fileContents); | ||
| if (fileToJSON !== undefined) { | ||
| fileToJSON.name = file.name.split('.')[0]; | ||
| uploadedData = await this.createVectorObjectFromJson(fileToJSON); | ||
| return uploadedData; | ||
| } | ||
| } catch (e) { | ||
| this.hsLog.warn('Uploaded file is not supported!', e); | ||
| return {error: 'couldNotUploadSelectedFile'}; | ||
| } | ||
| } | ||
| return uploadedData; | ||
| } | ||
|
|
||
| /** | ||
| * Convert uploaded KML or GPX files into GeoJSON format / parse loaded GeoJSON | ||
| * @param file - Uploaded KML, GPX or GeoJSON files | ||
| */ | ||
| async convertUploadedData(file: File): Promise<any> { | ||
| let parser; | ||
| const uploadedData: any = {}; | ||
| try { | ||
| const uploadedContent: any = await this.readUploadedFileAsText(file); | ||
| let fileType = this.hsAddDataVectorUtilsService.tryGuessTypeFromNameOrUrl( | ||
| file.name.toLowerCase(), | ||
| ); | ||
| switch (fileType) { | ||
| case 'kml': | ||
| const KML = (await import('ol/format/KML')).default; | ||
| parser = new KML(); | ||
| uploadedData.features = parser.readFeatures(uploadedContent); | ||
| break; | ||
| case 'gpx': | ||
| const GPX = (await import('ol/format/GPX')).default; | ||
| parser = new GPX(); | ||
| uploadedData.features = parser.readFeatures(uploadedContent); | ||
| fileType = 'json'; | ||
| break; | ||
| default: | ||
| } | ||
| if (uploadedData?.features?.length > 0) { | ||
| this.transformFeaturesIfNeeded( | ||
| uploadedData.features, | ||
| parser.readProjection(uploadedContent), | ||
| ); | ||
| } | ||
| uploadedData.nativeFeatures = parser.readFeatures(uploadedContent); | ||
| uploadedData.nativeSRS = parser.readProjection(uploadedContent); | ||
| uploadedData.title = file.name.split('.')[0].trim(); | ||
| uploadedData.name = uploadedData.title; | ||
| uploadedData.type = fileType; | ||
| return uploadedData; | ||
| } catch (e) { | ||
| this.hsLog.warn('Uploaded file is not supported' + e); | ||
| return {error: 'couldNotUploadSelectedFile'}; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Read features from uploaded file as objects | ||
| * @param json - Uploaded file parsed as json object | ||
| * @returns JSON object with file name and read features | ||
| */ | ||
| async createVectorObjectFromJson(json: any): Promise<any> { | ||
| let features: Feature[] = []; | ||
| const GeoJSON = (await import('ol/format/GeoJSON')).default; | ||
| const format = new GeoJSON(); | ||
| const projection = format.readProjection(json); | ||
| if (!projection) { | ||
| return { | ||
| error: 'ERROR.srsNotSupported', | ||
| }; | ||
| } | ||
| if (json.features?.length > 0) { | ||
| //FIXME: Type-cast shall be automatically inferred after OL >8.2 | ||
| features = format.readFeatures(json) as Feature[]; | ||
| this.transformFeaturesIfNeeded(features, projection); | ||
| } | ||
| const object = { | ||
| name: json.name, | ||
| title: json.name, | ||
| srs: this.hsAddDataVectorUtilsService.getFeaturesProjection(projection), | ||
| features: features, //Features in map crs | ||
| nativeFeatures: format.readFeatures(json), //Features in native CRS | ||
| nativeSRS: projection, | ||
| }; | ||
| return object; | ||
| } | ||
|
|
||
| /** | ||
| * Transform features to other projection if needed | ||
| * @param features - Extracted features from uploaded file | ||
| * @param projection - Projection to which transform the features | ||
| */ | ||
| transformFeaturesIfNeeded(features: Feature[], projection: Projection): void { | ||
| const mapProjection = this.hsMapService.getMap().getView().getProjection(); | ||
| if (projection != mapProjection) { | ||
| projection = epsg4326Aliases | ||
| .map((proj) => proj.getCode()) | ||
| .some((code) => code === projection.getCode()) | ||
| ? getProjection('EPSG:4326') | ||
| : projection; | ||
| features.forEach((f) => | ||
| //TODO: Make it parallel using workers or some library | ||
| f.getGeometry().transform(projection, mapProjection), | ||
| ); | ||
| } | ||
| } | ||
| } |
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