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client.go
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client.go
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// Package client defines types and functions for interacting with
// docconv HTTP servers.
package client
import (
"bytes"
"encoding/json"
"fmt"
"io"
"mime/multipart"
"net/http"
"os"
)
// DefaultProtocol is the default protocol used to construct paths
// when making docconv requests.
const DefaultProtocol = "http://"
// DefaultEndpoint is the default endpoint address (host:port) for
// docconv HTTP servers.
const DefaultEndpoint = "localhost:8888"
// DefaultHTTPClient is the default HTTP client used to make requests
// to docconv HTTP servers.
var DefaultHTTPClient = http.DefaultClient
// Opt is an option used in New to create Clients.
type Opt func(*Client)
// WithEndpoint set the endpoint on a Client.
func WithEndpoint(endpoint string) Opt {
return func(c *Client) {
c.endpoint = endpoint
}
}
// WithHTTPClient sets the *http.Client used for all underlying
// calls.
func WithHTTPClient(client *http.Client) Opt {
return func(c *Client) {
c.httpClient = client
}
}
// WithProtocol sets the protocol used in HTTP requests. Currently this
// must be either http:// or https://.
func WithProtocol(protocol string) Opt {
return func(c *Client) {
c.protocol = protocol
}
}
// New creates a new docconv client for interacting with a docconv HTTP
// server.
func New(opts ...Opt) *Client {
c := &Client{
endpoint: DefaultEndpoint,
protocol: DefaultProtocol,
httpClient: DefaultHTTPClient,
}
for _, opt := range opts {
opt(c)
}
return c
}
// Client is a docconv HTTP client. Use New to make new Clients.
type Client struct {
endpoint string
protocol string
httpClient *http.Client
}
// Response is from docconv.Response copied here to avoid dependency on
// the docconv package.
type Response struct {
Body string `json:"body"`
Meta map[string]string `json:"meta"`
MSecs uint32 `json:"msecs"`
Error string `json:"error"`
}
// Convert a file from a local path using the http client
func (c *Client) Convert(r io.Reader, filename string) (*Response, error) {
buf := &bytes.Buffer{}
w := multipart.NewWriter(buf)
part, err := w.CreateFormFile("input", filename)
if err != nil {
return nil, err
}
if _, err := io.Copy(part, r); err != nil {
return nil, err
}
if err := w.Close(); err != nil {
return nil, err
}
req, err := http.NewRequest("POST", fmt.Sprintf("%v%v/convert", c.protocol, c.endpoint), buf)
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", w.FormDataContentType())
resp, err := c.httpClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
res := &Response{}
if err := json.NewDecoder(resp.Body).Decode(&res); err != nil {
return nil, err
}
return res, nil
}
// ConvertPath uses the docconv Client to convert the local file
// found at path.
func ConvertPath(c *Client, path string) (*Response, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
return c.Convert(f, f.Name())
}