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import type { ExifFieldKey } from './exiffields.js';
import { match, type } from 'arktype';
import * as dates from 'date-fns';
import * as exifParser from 'exif-parser';
import piexif from 'piexifjs';
import { Schemas } from './database.js';
import { EXIF_FIELDS } from './exiffields.js';
import { errorMessage } from './i18n.js';
import * as db from './idb.svelte.js';
import { resolveMetadataImport, storeMetadataValue } from './metadata/index.js';
import { toasts } from './toasts.svelte.js';
import { byteString, byteStringToArray } from './utils.js';
export async function processExifData(
sessionId: string,
imageFileId: string,
imageBytes: ArrayBuffer | Buffer,
file: { type: string; name: string }
) {
const session = await db.tables.Session.get(sessionId);
Iif (!session) {
throw new Error(`Session ${sessionId} introuvable`);
}
const protocol = await db.tables.Protocol.get(session.protocol);
Iif (!protocol) {
throw new Error(`Protocole ${session.protocol} introuvable`);
}
const metadataOfProtocol = await db.tables.Metadata.getMany(
protocol.metadata.map((key) => resolveMetadataImport(protocol, key))
);
const metadataFromExif = await extractMetadata(
// 2^16 + 100 of margin
// see https://www.npmjs.com/package/exif-parser#creating-a-parser
imageBytes.slice(0, 2 ** 16 + 100),
metadataOfProtocol ?? []
).catch((e) => {
console.warn(e);
if (file.type === 'image/jpeg') {
toasts.warn(
`Impossible d'extraire les métadonnées EXIF de ${file.name}: ${e?.toString() ?? 'Erreur inattendue'}`
);
}
return {};
});
const images = await db
.listByIndex('Image', 'sessionId', sessionId)
.then((imgs) => imgs.filter((img) => img.fileId === imageFileId));
for (const { id: subjectId } of images) {
for (const [key, { value, confidence }] of Object.entries(metadataFromExif)) {
await storeMetadataValue({
db: db.databaseHandle(),
subjectId,
sessionId: session.id,
metadataId: key,
value,
confidence,
});
}
}
}
type ExifExtractionPlanItem = Pick<DB.Metadata, 'id' | 'infer' | 'type'>;
export async function extractMetadata(
buffer: ArrayBuffer | Buffer,
extractionPlan: ExifExtractionPlanItem[]
): Promise<Record<string, { value: unknown; confidence: number; alternatives: unknown[] }>> {
const exif = exifParser.create(buffer).enableImageSize(false).parse();
Iif (!exif) return {};
console.debug('Starting EXIF Extraction', { extractionPlan, exif });
const extract = match
.case(
{
type: '"location"',
infer: {
latitude: { exif: 'string' },
longitude: { exif: 'string' },
},
},
({ infer }) => {
if (!(infer.longitude.exif in exif.tags)) return undefined;
Iif (!(infer.latitude.exif in exif.tags)) return undefined;
return {
confidence: 1,
alternatives: [],
value: {
longitude: coerceExifValue(exif.tags[infer.longitude.exif], 'float'),
latitude: coerceExifValue(exif.tags[infer.latitude.exif], 'float'),
},
};
}
)
.case(
{
type: Schemas.MetadataTypeSchema,
infer: { exif: 'string' },
},
({ infer, type }) => {
Iif (!(infer.exif in exif.tags)) return undefined;
return {
confidence: 1,
alternatives: [],
value: coerceExifValue(exif.tags[infer.exif], type),
};
}
)
.default(() => undefined);
return Object.fromEntries(
extractionPlan
.map(({ id, ...option }) => {
return /** @type {const} */ [id, extract(option)];
})
.filter(
([, extracted]) =>
extracted !== undefined &&
!type({ latitude: 'number.NaN', longitude: 'number.NaN' }).allows(
extracted.value
) &&
!Number.isNaN(extracted.value)
)
);
}
export function coerceExifValue<T extends DB.MetadataType>(
value: unknown,
coerceTo: T
): import('./schemas/metadata.js').RuntimeValue<T> {
switch (coerceTo) {
case 'string':
return value?.toString() ?? '';
case 'boolean':
return Boolean(value);
case 'date':
Iif (value instanceof Date) return value;
if (typeof value !== 'number')
throw new Error(`Date value must be a number, was ${typeof value}`);
if (Number.isNaN(value)) throw new Error('Date value is invalid');
return new Date(value * 1e3);
case 'boundingbox':
throw new Error('Bounding box not supported in EXIF');
case 'enum':
if (typeof value !== 'string') throw new Error('Enum value must be a string');
return value;
case 'integer':
case 'float':
return Number(value);
default:
throw new Error(`Unknown type ${coerceTo}`);
}
}
/**
* Serialize a value to a string for EXIF writing
*/
export function serializeExifValue(value: unknown): string | unknown[] {
if (value instanceof Date) return dates.format(value, 'yyyy:MM:dd HH:mm:ss');
// Let multivalued exif entries through
if (Array.isArray(value)) return value;
if (typeof value === 'number') return [value];
if (value === undefined) return 'undefined';
if (value === null) return 'null';
if (typeof value === 'object' && value !== null) {
return Object.entries(value)
.map(([key, val]) => `${key}=${val}`)
.join(';');
}
return value?.toString() ?? '';
}
export function addExifMetadata(
bytes: ArrayBuffer | Buffer,
metadataDefs: DB.Metadata[],
metadataValues: DB.MetadataValues
): Uint8Array {
const ExifMetadata = Schemas.Metadata.and({
infer: [
{ exif: 'string' },
'|',
{ latitude: { exif: 'string' }, longitude: { exif: 'string' } },
],
});
const changes: Partial<Record<ExifFieldKey, unknown>> = {};
for (const def of metadataDefs.map((m) => ExifMetadata(m))) {
if (def instanceof type.errors) continue;
const value = metadataValues[def.id]?.value;
Iif (value === undefined) continue;
if (
type({ latitude: { exif: 'string' }, longitude: { exif: 'string' } }).allows(
def.infer
) &&
type({ latitude: 'number', longitude: 'number' }).allows(value)
) {
// XXX harcoded BS :/
if (def.infer.latitude.exif === 'GPSLatitude') {
changes['GPSLatitudeRef'] = value.latitude >= 0 ? 'N' : 'S';
changes['GPSLatitude'] = piexif.GPSHelper.degToDmsRational(value.latitude);
} else E{
changes[def.infer.latitude.exif] = value.latitude;
}
// XXX harcoded BS :/
if (def.infer.longitude.exif === 'GPSLongitude') {
changes['GPSLongitudeRef'] = value.longitude >= 0 ? 'E' : 'W';
changes['GPSLongitude'] = piexif.GPSHelper.degToDmsRational(value.longitude);
} else E{
changes[def.infer.longitude.exif] = value.longitude;
}
} else {
changes[def.infer.exif] = value;
}
}
return setExifFields(bytes, changes);
}
export function setExifFields(bytes: ArrayBuffer, changes: Partial<Record<ExifFieldKey, unknown>>) {
const bytestring = byteString(new Uint8Array(bytes));
try {
const exifDict = piexif.load(bytestring);
// Prevent any write if no exif data changed
let dirty = false;
for (const [key, value] of Object.entries(changes)) {
const field = EXIF_FIELDS[key];
const [category] =
Object.entries(exifDict).find(([, tags]) => tags && field in tags) ??
Object.entries(piexif.TAGS).find(
([cat, tags]) => cat !== 'Image' && field in tags
) ??
[];
Iif (!category) continue;
const serialized = serializeExifValue(value);
Iif (serialized === undefined) continue;
if (serialized === exifDict[category][field]) continue;
exifDict[category][field] = serialized;
dirty = true;
}
Iif (!dirty) return new Uint8Array(bytes);
const outputstr = piexif.insert(piexif.dump(exifDict), bytestring);
return byteStringToArray(outputstr);
} catch (error) {
toasts.warn(errorMessage(error, 'Impossible de modifier les données EXIF'));
return new Uint8Array(buffer);
}
}
|