/
attachments.go
105 lines (93 loc) · 2.9 KB
/
attachments.go
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package couchdb
import (
"context"
"encoding/base64"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"github.com/flimzy/kivik"
"github.com/flimzy/kivik/driver"
"github.com/flimzy/kivik/driver/couchdb/chttp"
)
func (d *db) PutAttachment(ctx context.Context, docID, rev, filename, contentType string, body io.Reader) (newRev string, err error) {
opts := &chttp.Options{
Body: body,
ContentType: contentType,
}
query := url.Values{}
if rev != "" {
query.Add("rev", rev)
}
var response struct {
Rev string `json:"rev"`
}
_, err = d.Client.DoJSON(ctx, kivik.MethodPut, d.path(chttp.EncodeDocID(docID)+"/"+filename, query), opts, &response)
if err != nil {
return "", err
}
return response.Rev, nil
}
func (d *db) GetAttachmentMeta(ctx context.Context, docID, rev, filename string) (cType string, md5sum driver.MD5sum, err error) {
resp, err := d.fetchAttachment(ctx, kivik.MethodHead, docID, rev, filename)
if err != nil {
return "", driver.MD5sum{}, err
}
cType, md5sum, body, err := d.decodeAttachment(resp)
body.Close()
return cType, md5sum, err
}
func (d *db) GetAttachment(ctx context.Context, docID, rev, filename string) (cType string, md5sum driver.MD5sum, body io.ReadCloser, err error) {
resp, err := d.fetchAttachment(ctx, kivik.MethodGet, docID, rev, filename)
if err != nil {
return "", driver.MD5sum{}, nil, err
}
return d.decodeAttachment(resp)
}
func (d *db) fetchAttachment(ctx context.Context, method, docID, rev, filename string) (*http.Response, error) {
query := url.Values{}
if rev != "" {
query.Add("rev", rev)
}
resp, err := d.Client.DoReq(ctx, method, d.path(chttp.EncodeDocID(docID)+"/"+filename, query), nil)
if err != nil {
return nil, err
}
return resp, chttp.ResponseError(resp)
}
func (d *db) decodeAttachment(resp *http.Response) (cType string, md5sum driver.MD5sum, body io.ReadCloser, err error) {
var ok bool
if cType, ok = getContentType(resp); !ok {
return "", driver.MD5sum{}, nil, errors.New("no Content-Type in response")
}
md5sum, err = getMD5Checksum(resp)
return cType, md5sum, resp.Body, err
}
func getContentType(resp *http.Response) (ctype string, ok bool) {
ctype = resp.Header.Get("Content-Type")
_, ok = resp.Header["Content-Type"]
return ctype, ok
}
func getMD5Checksum(resp *http.Response) (md5sum driver.MD5sum, err error) {
hash, err := base64.StdEncoding.DecodeString(resp.Header.Get("Content-MD5"))
if err != nil {
err = fmt.Errorf("failed to decode MD5 checksum: %s", err)
}
copy(md5sum[:], hash)
return md5sum, err
}
func (d *db) DeleteAttachment(ctx context.Context, docID, rev, filename string) (newRev string, err error) {
query := url.Values{}
if rev != "" {
query.Add("rev", rev)
}
var response struct {
Rev string `json:"rev"`
}
_, err = d.Client.DoJSON(ctx, kivik.MethodDelete, d.path(chttp.EncodeDocID(docID)+"/"+filename, query), nil, &response)
if err != nil {
return "", err
}
return response.Rev, nil
}