1	/*
     2	Copyright 2011 The Perkeep Authors
     3	
     4	Licensed under the Apache License, Version 2.0 (the "License");
     5	you may not use this file except in compliance with the License.
     6	You may obtain a copy of the License at
     7	
     8	     http://www.apache.org/licenses/LICENSE-2.0
     9	
    10	Unless required by applicable law or agreed to in writing, software
    11	distributed under the License is distributed on an "AS IS" BASIS,
    12	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13	See the License for the specific language governing permissions and
    14	limitations under the License.
    15	*/
    16	
    17	package client
    18	
    19	import (
    20		"context"
    21		"errors"
    22		"fmt"
    23		"net/http"
    24		"net/url"
    25		"strings"
    26	
    27		"perkeep.org/internal/httputil"
    28		"perkeep.org/pkg/blob"
    29		"perkeep.org/pkg/blobserver/handlers"
    30	)
    31	
    32	// RemoveBlobs removes the list of blobs. An error is returned if the
    33	// server failed to remove a blob. Removing a non-existent blob isn't
    34	// an error.
    35	func (c *Client) RemoveBlobs(ctx context.Context, blobs []blob.Ref) error {
    36		if c.sto != nil {
    37			return c.sto.RemoveBlobs(ctx, blobs)
    38		}
    39		pfx, err := c.prefix()
    40		if err != nil {
    41			return err
    42		}
    43		url_ := fmt.Sprintf("%s/camli/remove", pfx)
    44		params := make(url.Values)             // "blobN" -> BlobRefStr
    45		needsDelete := make(map[blob.Ref]bool) // BlobRefStr -> true
    46		for n, b := range blobs {
    47			if !b.Valid() {
    48				return errors.New("Cannot delete invalid blobref")
    49			}
    50			key := fmt.Sprintf("blob%v", n+1)
    51			params.Add(key, b.String())
    52			needsDelete[b] = true
    53		}
    54	
    55		req, err := http.NewRequest("POST", url_, strings.NewReader(params.Encode()))
    56		if err != nil {
    57			return fmt.Errorf("Error creating RemoveBlobs POST request: %v", err)
    58		}
    59		req = req.WithContext(ctx)
    60		req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
    61		c.authMode.AddAuthHeader(req)
    62		resp, err := c.httpClient.Do(req)
    63		if err != nil {
    64			resp.Body.Close()
    65			return fmt.Errorf("Got status code %d from blobserver for remove %s", resp.StatusCode, params.Encode())
    66		}
    67		var remResp handlers.RemoveResponse
    68		decodeErr := httputil.DecodeJSON(resp, &remResp)
    69		if resp.StatusCode != 200 {
    70			resp.Body.Close()
    71			if decodeErr == nil {
    72				return fmt.Errorf("invalid http response %d in remove response: %v", resp.StatusCode, remResp.Error)
    73			} else {
    74				return fmt.Errorf("invalid http response %d in remove response", resp.StatusCode)
    75			}
    76		}
    77		if decodeErr != nil {
    78			return fmt.Errorf("failed to parse remove response: %v", err)
    79		}
    80		for _, br := range remResp.Removed {
    81			delete(needsDelete, br)
    82		}
    83		if len(needsDelete) > 0 {
    84			return fmt.Errorf("failed to remove blobs %s", strings.Join(stringKeys(needsDelete), ", "))
    85		}
    86		return nil
    87	}
    88	
    89	// RemoveBlob removes the provided blob. An error is returned if the server failed to remove
    90	// the blob. Removing a non-existent blob isn't an error.
    91	func (c *Client) RemoveBlob(ctx context.Context, b blob.Ref) error {
    92		return c.RemoveBlobs(ctx, []blob.Ref{b})
    93	}
    94	
    95	func stringKeys(m map[blob.Ref]bool) (s []string) {
    96		s = make([]string, 0, len(m))
    97		for key := range m {
    98			s = append(s, key.String())
    99		}
   100		return
   101	}