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feat: Expose ConversionUtil.

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This commit is contained in:
Ruben Verborgh
2021-01-02 13:58:42 +01:00
parent a73936f522
commit dfc1d4662f
8 changed files with 46 additions and 43 deletions
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14
src/storage/conversion/ConversionUtil.ts
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@@ -21,7 +21,7 @@ import type { RepresentationConverterArgs } from './RepresentationConverter';
*
* @returns The weighted and filtered list of matching types.
*/
export const matchingTypes = (preferences: RepresentationPreferences, types: string[]):
export const matchingMediaTypes = (preferences: RepresentationPreferences, types: string[]):
RepresentationPreference[] => {
if (!Array.isArray(preferences.type)) {
throw new BadRequestHttpError('Output type required for conversion.');
@@ -65,7 +65,7 @@ RepresentationPreference[] => {
*
* @returns True if the media type patterns can match each other.
*/
export const matchingMediaType = (mediaA: string, mediaB: string): boolean => {
export const matchesMediaType = (mediaA: string, mediaB: string): boolean => {
if (mediaA === mediaB) {
return true;
}
@@ -85,24 +85,26 @@ export const matchingMediaType = (mediaA: string, mediaB: string): boolean => {
};
/**
* Runs some standard checks on the input request:
* Determines whether the given conversion request is supported,
* given the available content type conversions:
* - Checks if there is a content type for the input.
* - Checks if the input type is supported by the parser.
* - Checks if the parser can produce one of the preferred output types.
* Throws an error with details if conversion is not possible.
* @param request - Incoming arguments.
* @param supportedIn - Media types that can be parsed by the converter.
* @param supportedOut - Media types that can be produced by the converter.
*/
export const validateRequestArgs = (request: RepresentationConverterArgs, supportedIn: string[],
export const supportsConversion = (request: RepresentationConverterArgs, supportedIn: string[],
supportedOut: string[]): void => {
const inType = request.representation.metadata.contentType;
if (!inType) {
throw new BadRequestHttpError('Input type required for conversion.');
}
if (!supportedIn.some((type): boolean => matchingMediaType(inType, type))) {
if (!supportedIn.some((type): boolean => matchesMediaType(inType, type))) {
throw new NotImplementedHttpError(`Can only convert from ${supportedIn} to ${supportedOut}.`);
}
if (matchingTypes(request.preferences, supportedOut).length <= 0) {
if (matchingMediaTypes(request.preferences, supportedOut).length <= 0) {
throw new NotImplementedHttpError(`Can only convert from ${supportedIn} to ${supportedOut}.`);
}
};