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49 lines
1.3 KiB
TypeScript
49 lines
1.3 KiB
TypeScript
import _ from 'lodash';
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import { SignalService } from '../protobuf';
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import { sha256 } from '../session/crypto';
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const recentHashByConvo = new Map<string, Array<string>>();
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const maxHashToKeepPerConvo = 50;
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export function isDuplicateBasedOnHash(
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dataMessage: SignalService.DataMessage,
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conversationId: string,
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sender: string
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): boolean {
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const toUseForHash = {
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..._.omit(
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SignalService.DataMessage.toObject(dataMessage),
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'timestamp',
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'profile',
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'preview',
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'profileKey'
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),
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conversationId,
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sender,
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};
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if (!recentHashByConvo.has(conversationId)) {
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recentHashByConvo.set(conversationId, new Array());
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}
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const newHash = sha256(JSON.stringify(toUseForHash));
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// this can only be set based on the .set above()
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let recentHashForConvo = recentHashByConvo.get(conversationId) as Array<string>;
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// this hash already exists for this convo
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if (recentHashForConvo.some(n => n === newHash)) {
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return true;
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}
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// push the new hash at the end
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recentHashForConvo.push(newHash);
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if (recentHashForConvo.length > maxHashToKeepPerConvo) {
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// slice the last maxHashToKeepPerConvo hashes
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recentHashForConvo = recentHashForConvo?.slice(-maxHashToKeepPerConvo);
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}
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recentHashByConvo.set(conversationId, recentHashForConvo);
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return false;
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}
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// build a hash of the data and check against recent messages
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