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parse_server.go
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parse_server.go
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package parser
import (
"fmt"
"go/token"
"github.com/go-faster/errors"
"golang.org/x/exp/slices"
"github.com/ogen-go/ogen"
"github.com/ogen-go/ogen/jsonpointer"
"github.com/ogen-go/ogen/openapi"
)
func (p *parser) parseServers(servers []ogen.Server, ctx *jsonpointer.ResolveCtx) ([]openapi.Server, error) {
if len(servers) == 0 {
return nil, nil
}
var (
r = make([]openapi.Server, len(servers))
dedup = map[string]struct{}{}
)
for i, s := range servers {
srv, err := p.parseServer(s, dedup, ctx)
if err != nil {
return nil, err
}
r[i] = srv
}
return r, nil
}
func (p *parser) parseServer(
s ogen.Server,
dedup map[string]struct{},
ctx *jsonpointer.ResolveCtx,
) (_ openapi.Server, rerr error) {
locator := s.Common.Locator
defer func() {
rerr = p.wrapLocation(p.file(ctx), locator, rerr)
}()
// Validate variables.
for _, v := range s.Variables {
locator := v.Common.Locator
if len(v.Enum) > 0 {
locator := locator.Field("enum")
if !slices.Contains(v.Enum, v.Default) {
err := errors.Errorf("the default value %q MUST exist in the enum's values", v.Default)
return openapi.Server{}, p.wrapLocation(p.file(ctx), locator, err)
}
for i, e := range v.Enum {
locator := locator.Index(i)
found := slices.Index(v.Enum, e)
if found < 0 {
panic(fmt.Sprintf("unreachable: slice %#v doesn't contain %q", v.Enum, e))
}
if found != i {
err := errors.Errorf("enum MUST NOT contain duplicate values: %q", e)
return openapi.Server{}, p.wrapLocation(p.file(ctx), locator, err)
}
}
}
}
// Validate URL.
u, err := func() (openapi.ServerURL, error) {
if s.URL == "" {
return nil, errors.New("server URL must not be empty")
}
return parseServerURL(s.URL, func(name string) (sv openapi.ServerVariable, _ bool) {
v, ok := s.Variables[name]
if !ok {
return sv, false
}
return openapi.ServerVariable{
Name: name,
Description: v.Description,
Default: v.Default,
Enum: slices.Clone(v.Enum),
}, true
})
}()
if err != nil {
locator := locator.Field("url")
return openapi.Server{}, p.wrapLocation(p.file(ctx), locator, err)
}
server := openapi.Server{
Template: u,
Description: s.Description,
}
// Parse extensions.
//
// TODO(tdakkota): describe extensions somewhere, it would be nice to have machine-readable
// description of extensions, their types, and their validation rules.
const nameKey = "x-ogen-server-name"
if nameNode, ok := s.Common.Extensions[nameKey]; ok {
if err := func() error {
if err := nameNode.Decode(&server.Name); err != nil {
return err
}
name := server.Name
switch {
case name == "":
return errors.New("server name must not be empty")
case !token.IsIdentifier(name + "Server"):
// Ensure that ${name}Server is a valid Go identifier.
return errors.Errorf("server name %q cannot be used as a Go identifier", name)
}
if _, ok := dedup[name]; ok {
return errors.Errorf("server name %q is not unique", name)
}
dedup[name] = struct{}{}
return nil
}(); err != nil {
locator := locator.Field(nameKey)
return openapi.Server{}, p.wrapLocation(p.file(ctx), locator, err)
}
}
return server, nil
}