@tokenizer/http/lib/response-info.js

HTTP tokenizer for Node.js and browser

import { parseContentRange as rangeParseContentRange } from '@tokenizer/range';
export class ResponseInfo {
    constructor(response) {
        this.response = response;
    }
    getContentLength() {
        const contentLength = this.response.headers.get('Content-Length');
        return contentLength ? Number.parseInt(contentLength, 10) : undefined;
    }
    getAcceptRangesHeaderValue() {
        return this.response.headers.get('Accept-Ranges');
    }
    getContentType() {
        return this.response.headers.get('Content-Type');
    }
    acceptRanges() {
        const value = this.getAcceptRangesHeaderValue();
        return value !== null && value.trim().toLowerCase() === 'bytes';
    }
    getContentRange() {
        const contentRange = this.response.headers.get('Content-Range');
        if (!contentRange) {
            return;
        }
        return rangeParseContentRange(contentRange);
    }
    toRangeRequestResponse() {
        const contentRange = this.getContentRange();
        const size = contentRange ? contentRange.instanceLength : this.getContentLength();
        if (typeof size !== 'number') {
            throw new Error('Could not determine file-size from HTTP response');
        }
        return {
            url: this.response.url,
            size,
            mimeType: this.getContentType() ?? undefined,
            acceptPartialRequests: this.acceptRanges(),
            contentRange,
            arrayBuffer: () => this.response.arrayBuffer().then(res => new Uint8Array(res))
        };
    }
}
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