harness-drone/contrib/generate-api-docs.go

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2015-10-06 17:19:43 +00:00
// +build ignore
// This program generates api documentation from a
// swaggerfile using an amber template.
package main
import (
"crypto/md5"
"flag"
"fmt"
"io"
"log"
"os"
"sort"
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"github.com/eknkc/amber"
"github.com/go-swagger/go-swagger/spec"
)
var (
templ = flag.String("template", "index.amber", "")
input = flag.String("input", "swagger.json", "")
output = flag.String("output", "", "")
)
func main() {
flag.Parse()
// parses the swagger spec file
spec, err := spec.YAMLSpec(*input)
if err != nil {
log.Fatal(err)
}
swag := spec.Spec()
// create output source for file. defaults to
// stdout but may be file.
var w io.WriteCloser = os.Stdout
if *output != "" {
w, err = os.Create(*output)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return
}
defer w.Close()
}
// we wrap the swagger file in a map, otherwise it
// won't work with our existing templates, which expect
// a map as the root parameter.
var data = map[string]interface{}{
"Swagger": normalize(swag),
}
t := amber.MustCompileFile(*templ, amber.DefaultOptions)
err = t.Execute(w, data)
if err != nil {
log.Fatal(err)
}
}
// Swagger is a simplified representation of the swagger
// document with a subset of the fields used to generate
// our API documentation.
type Swagger struct {
Tags []Tag
}
type Tag struct {
Name string
Ops []Operation
}
type Operation struct {
ID string
Method string
Path string
Desc string
Summary string
Params []Param
Results []Result
}
type Param struct {
Name string
Desc string
Type string
Example interface{}
InputTo string
IsObject bool
}
type Result struct {
Status int
Desc string
Example interface{}
IsObject bool
IsArray bool
}
// normalize is a helper function that normalizes the swagger
// file to a simpler format that makes it easier to work with
// inside the template.
func normalize(swag *spec.Swagger) Swagger {
swag_ := Swagger{}
for _, tag := range swag.Tags {
tag_ := Tag{Name: tag.Name}
// group the paths based on their tag value.
for route, path := range swag.Paths.Paths {
var ops = []*spec.Operation{
path.Get,
path.Put,
path.Post,
path.Patch,
path.Delete,
}
// flatten the operations into an array and convert
// the underlying data so that it is a bit easier to
// work with.
for _, op := range ops {
// the operation must have a tag to
// be rendered in our custom template.
if op == nil || !hasTag(tag.Name, op.Tags) {
continue
}
item := Operation{}
item.Path = route
item.Method = getMethod(op, path)
item.Desc = op.Description
item.Summary = op.Summary
item.ID = fmt.Sprintf("%x", md5.Sum([]byte(item.Path+item.Method)))
// convert the operation input parameters into
// our internal format so that it is easier to
// work with in the template.
for _, param := range op.Parameters {
param_ := Param{}
param_.Name = param.Name
param_.Desc = param.Description
param_.Type = param.Type
param_.IsObject = param.Schema != nil
param_.InputTo = param.In
if param_.IsObject {
param_.Type = param.Schema.Ref.GetPointer().String()[13:]
param_.Example = param.Schema.Example
}
item.Params = append(item.Params, param_)
}
// convert the operation response types into
// our internal format so that it is easier to
// work with in the template.
for code, resp := range op.Responses.StatusCodeResponses {
result := Result{}
result.Desc = resp.Description
result.Status = code
result.IsObject = resp.Schema != nil
if result.IsObject {
result.IsArray = resp.Schema.Items != nil
name := resp.Schema.Ref.GetPointer().String()
if len(name) != 0 {
def, _ := swag.Definitions[name[13:]]
result.Example = def.Example
}
}
if result.IsArray {
name := resp.Schema.Items.Schema.Ref.GetPointer().String()
def, _ := swag.Definitions[name[13:]]
result.Example = def.Example
}
item.Results = append(item.Results, result)
}
sort.Sort(ByCode(item.Results))
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tag_.Ops = append(tag_.Ops, item)
}
}
sort.Sort(ByPath(tag_.Ops))
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swag_.Tags = append(swag_.Tags, tag_)
}
return swag_
}
// hasTag is a helper function that returns true if
// an operation has the specified tag label.
func hasTag(want string, in []string) bool {
for _, got := range in {
if got == want {
return true
}
}
return false
}
// getMethod is a helper function that returns the http
// method for the specified operation in a path.
func getMethod(op *spec.Operation, path spec.PathItem) string {
switch {
case op == path.Get:
return "GET"
case op == path.Put:
return "PUT"
case op == path.Patch:
return "PATCH"
case op == path.Post:
return "POST"
case op == path.Delete:
return "DELETE"
}
return ""
}
// ByCode helps sort a list of results by status code
type ByCode []Result
func (a ByCode) Len() int { return len(a) }
func (a ByCode) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a ByCode) Less(i, j int) bool { return a[i].Status < a[j].Status }
// ByPath helps sort a list of endpoints by path
type ByPath []Operation
func (a ByPath) Len() int { return len(a) }
func (a ByPath) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a ByPath) Less(i, j int) bool { return a[i].Path < a[j].Path }