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package loads
import (
"encoding/json"
"errors"
"net/url"
"github.com/go-openapi/spec"
"github.com/go-openapi/swag"
)
var (
// Default chain of loaders, defined at the package level.
//
// By default this matches json and yaml documents.
//
// May be altered with AddLoader().
loaders *loader
)
func init() {
jsonLoader := &loader{
DocLoaderWithMatch: DocLoaderWithMatch{
Match: func(_ string) bool {
return true
},
Fn: JSONDoc,
},
}
loaders = jsonLoader.WithHead(&loader{
DocLoaderWithMatch: DocLoaderWithMatch{
Match: swag.YAMLMatcher,
Fn: swag.YAMLDoc,
},
})
// sets the global default loader for go-openapi/spec
spec.PathLoader = loaders.Load
}
// DocLoader represents a doc loader type
type DocLoader func(string) (json.RawMessage, error)
// DocMatcher represents a predicate to check if a loader matches
type DocMatcher func(string) bool
// DocLoaderWithMatch describes a loading function for a given extension match.
type DocLoaderWithMatch struct {
Fn DocLoader
Match DocMatcher
}
// NewDocLoaderWithMatch builds a DocLoaderWithMatch to be used in load options
func NewDocLoaderWithMatch(fn DocLoader, matcher DocMatcher) DocLoaderWithMatch {
return DocLoaderWithMatch{
Fn: fn,
Match: matcher,
}
}
type loader struct {
DocLoaderWithMatch
Next *loader
}
// WithHead adds a loader at the head of the current stack
func (l *loader) WithHead(head *loader) *loader {
if head == nil {
return l
}
head.Next = l
return head
}
// WithNext adds a loader at the trail of the current stack
func (l *loader) WithNext(next *loader) *loader {
l.Next = next
return next
}
// Load the raw document from path
func (l *loader) Load(path string) (json.RawMessage, error) {
_, erp := url.Parse(path)
if erp != nil {
return nil, erp
}
lastErr := errors.New("no loader matched") // default error if no match was found
for ldr := l; ldr != nil; ldr = ldr.Next {
if ldr.Match != nil && !ldr.Match(path) {
continue
}
// try then move to next one if there is an error
b, err := ldr.Fn(path)
if err == nil {
return b, nil
}
lastErr = err
}
return nil, lastErr
}
// JSONDoc loads a json document from either a file or a remote url
func JSONDoc(path string) (json.RawMessage, error) {
data, err := swag.LoadFromFileOrHTTP(path)
if err != nil {
return nil, err
}
return json.RawMessage(data), nil
}
// AddLoader for a document, executed before other previously set loaders.
//
// This sets the configuration at the package level.
//
// NOTE:
// - this updates the default loader used by github.com/go-openapi/spec
// - since this sets package level globals, you shouln't call this concurrently
func AddLoader(predicate DocMatcher, load DocLoader) {
loaders = loaders.WithHead(&loader{
DocLoaderWithMatch: DocLoaderWithMatch{
Match: predicate,
Fn: load,
},
})
// sets the global default loader for go-openapi/spec
spec.PathLoader = loaders.Load
}