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return first offer when no accept header set (#351)

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tobi 2021-12-20 11:08:54 +01:00 committed by GitHub
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1 changed files with 12 additions and 10 deletions
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22
internal/api/negotiate.go
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@ -56,17 +56,18 @@ var HTMLAcceptHeaders = []Offer{
// slice of Offers, and performs content negotiation for the given request // slice of Offers, and performs content negotiation for the given request
// with the given content-type offers. It will return a string representation // with the given content-type offers. It will return a string representation
// of the first suitable content-type, or an error if something goes wrong or // of the first suitable content-type, or an error if something goes wrong or
// a suiteable content-type cannot be matched. // a suitable content-type cannot be matched.
// //
// For example, if the request in the *gin.Context has Accept headers of value // For example, if the request in the *gin.Context has Accept headers of value
// [application/json, text/html], and the provided offers are of value // [application/json, text/html], and the provided offers are of value
// [application/json, application/xml], then the returned string will be // [application/json, application/xml], then the returned string will be
// 'application/json', which indicates the content-type that should be returned. // 'application/json', which indicates the content-type that should be returned.
// //
// If there are no Accept headers in the request, or the length of offers is 0, // If the length of offers is 0, then an error will be returned, so this function
// then an error will be returned, so this function should only be called in places // should only be called in places where format negotiation is actually needed.
// where format negotiation is actually needed and headers are expected to be present //
// on incoming requests. // If there are no Accept headers in the request, then the first offer will be returned,
// under the assumption that it's better to serve *something* than error out completely.
// //
// Callers can use the offer slices exported in this package as shortcuts for // Callers can use the offer slices exported in this package as shortcuts for
// often-used Accept types. // often-used Accept types.
@ -77,16 +78,17 @@ func NegotiateAccept(c *gin.Context, offers ...Offer) (string, error) {
return "", errors.New("no format offered") return "", errors.New("no format offered")
} }
accepts := c.Request.Header.Values("Accept")
if len(accepts) == 0 {
return "", fmt.Errorf("no Accept header(s) set on incoming request; this endpoint offers %s", offers)
}
strings := []string{} strings := []string{}
for _, o := range offers { for _, o := range offers {
strings = append(strings, string(o)) strings = append(strings, string(o))
} }
accepts := c.Request.Header.Values("Accept")
if len(accepts) == 0 {
// there's no accept header set, just return the first offer
return strings[0], nil
}
format := c.NegotiateFormat(strings...) format := c.NegotiateFormat(strings...)
if format == "" { if format == "" {
return "", fmt.Errorf("no format can be offered for requested Accept header(s) %s; this endpoint offers %s", accepts, offers) return "", fmt.Errorf("no format can be offered for requested Accept header(s) %s; this endpoint offers %s", accepts, offers)