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converter.js
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converter.js
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import {compose} from './lib/composer.js';
import {logError, memoize} from '../../src/utils.js';
import {DEFAULT_PROCESSORS} from './processors/default.js';
import {BID_RESPONSE, DEFAULT, getProcessors, IMP, REQUEST, RESPONSE} from '../../src/pbjsORTB.js';
import {mergeProcessors} from './lib/mergeProcessors.js';
export function ortbConverter({
context: defaultContext = {},
processors = defaultProcessors,
overrides = {},
imp,
request,
bidResponse,
response,
} = {}) {
const REQ_CTX = new WeakMap();
function builder(slot, wrapperFn, builderFn, errorHandler) {
let build;
return function () {
if (build == null) {
build = (function () {
let delegate = builderFn.bind(this, compose(processors()[slot] || {}, overrides[slot] || {}));
if (wrapperFn) {
delegate = wrapperFn.bind(this, delegate);
}
return function () {
try {
return delegate.apply(this, arguments);
} catch (e) {
errorHandler.call(this, e, ...arguments);
}
}
})();
}
return build.apply(this, arguments);
}
}
const buildImp = builder(IMP, imp,
function (process, bidRequest, context) {
const imp = {};
process(imp, bidRequest, context);
return imp;
},
function (error, bidRequest, context) {
logError('Error while converting bidRequest to ORTB imp; request skipped.', {error, bidRequest, context});
}
);
const buildRequest = builder(REQUEST, request,
function (process, imps, bidderRequest, context) {
const ortbRequest = {imp: imps};
process(ortbRequest, bidderRequest, context);
return ortbRequest;
},
function (error, imps, bidderRequest, context) {
logError('Error while converting to ORTB request', {error, imps, bidderRequest, context});
throw error;
}
);
const buildBidResponse = builder(BID_RESPONSE, bidResponse,
function (process, bid, context) {
const bidResponse = {};
process(bidResponse, bid, context);
return bidResponse;
},
function (error, bid, context) {
logError('Error while converting ORTB seatbid.bid to bidResponse; bid skipped.', {error, bid, context});
}
);
const buildResponse = builder(RESPONSE, response,
function (process, bidResponses, ortbResponse, context) {
const response = {bids: bidResponses};
process(response, ortbResponse, context);
return response;
},
function (error, bidResponses, ortbResponse, context) {
logError('Error while converting from ORTB response', {error, bidResponses, ortbResponse, context});
throw error;
}
);
return {
toORTB({bidderRequest, bidRequests, context = {}}) {
bidRequests = bidRequests || bidderRequest.bids;
const ctx = {
req: Object.assign({bidRequests}, defaultContext, context),
imp: {}
}
ctx.req.impContext = ctx.imp;
const imps = bidRequests.map(bidRequest => {
const impContext = Object.assign({bidderRequest, reqContext: ctx.req}, defaultContext, context);
const result = buildImp(bidRequest, impContext);
if (result != null) {
if (result.hasOwnProperty('id')) {
Object.assign(impContext, {bidRequest, imp: result});
ctx.imp[result.id] = impContext;
return result;
}
logError('Converted ORTB imp does not specify an id, ignoring bid request', bidRequest, result);
}
}).filter(Boolean);
const request = buildRequest(imps, bidderRequest, ctx.req);
ctx.req.bidderRequest = bidderRequest;
if (request != null) {
REQ_CTX.set(request, ctx);
}
return request;
},
fromORTB({request, response}) {
const ctx = REQ_CTX.get(request);
if (ctx == null) {
throw new Error('ortbRequest passed to `fromORTB` must be the same object returned by `toORTB`')
}
function augmentContext(ctx, extraParams = {}) {
return Object.assign(ctx, {ortbRequest: request}, extraParams, ctx);
}
const impsById = Object.fromEntries((request.imp || []).map(imp => [imp.id, imp]));
const bidResponses = (response.seatbid || []).flatMap(seatbid =>
(seatbid.bid || []).map((bid) => {
if (impsById.hasOwnProperty(bid.impid) && ctx.imp.hasOwnProperty(bid.impid)) {
return buildBidResponse(bid, augmentContext(ctx.imp[bid.impid], {imp: impsById[bid.impid], seatbid, ortbResponse: response}));
}
logError('ORTB response seatbid[].bid[].impid does not match any imp in request; ignoring bid', bid);
})
).filter(Boolean);
return buildResponse(bidResponses, response, augmentContext(ctx.req));
}
}
}
export const defaultProcessors = memoize(() => mergeProcessors(DEFAULT_PROCESSORS, getProcessors(DEFAULT)));