cuelabs.dev/go/oci/ociregistry@v0.0.0-20240906074133-82eb438dd565/internal/ocirequest/create.go (about)

     1  // Copyright 2023 CUE Labs AG
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package ocirequest
    16  
    17  import (
    18  	"encoding/base64"
    19  	"fmt"
    20  	"net/url"
    21  )
    22  
    23  func (req *Request) Construct() (method string, ustr string, err error) {
    24  	method, ustr = req.construct()
    25  	u, err := url.Parse(ustr)
    26  	if err != nil {
    27  		return "", "", fmt.Errorf("invalid OCI request: %v", err)
    28  	}
    29  	if _, err := Parse(method, u); err != nil {
    30  		return "", "", fmt.Errorf("invalid OCI request: %v", err)
    31  	}
    32  	return method, ustr, nil
    33  }
    34  
    35  func (req *Request) MustConstruct() (method string, ustr string) {
    36  	method, ustr, err := req.Construct()
    37  	if err != nil {
    38  		panic(err)
    39  	}
    40  	return method, ustr
    41  }
    42  
    43  func (req *Request) construct() (method string, url string) {
    44  	switch req.Kind {
    45  	case ReqPing:
    46  		return "GET", "/v2/"
    47  	case ReqBlobGet:
    48  		return "GET", "/v2/" + req.Repo + "/blobs/" + req.Digest
    49  	case ReqBlobHead:
    50  		return "HEAD", "/v2/" + req.Repo + "/blobs/" + req.Digest
    51  	case ReqBlobDelete:
    52  		return "DELETE", "/v2/" + req.Repo + "/blobs/" + req.Digest
    53  	case ReqBlobStartUpload:
    54  		return "POST", "/v2/" + req.Repo + "/blobs/uploads/"
    55  	case ReqBlobUploadBlob:
    56  		return "POST", "/v2/" + req.Repo + "/blobs/uploads/?digest=" + req.Digest
    57  	case ReqBlobMount:
    58  		return "POST", "/v2/" + req.Repo + "/blobs/uploads/?mount=" + req.Digest + "&from=" + req.FromRepo
    59  	case ReqBlobUploadInfo:
    60  		// Note: this is specific to the ociserver implementation.
    61  		return "GET", req.uploadPath()
    62  	case ReqBlobUploadChunk:
    63  		// Note: this is specific to the ociserver implementation.
    64  		return "PATCH", req.uploadPath()
    65  	case ReqBlobCompleteUpload:
    66  		// Note: this is specific to the ociserver implementation.
    67  		// TODO this is bogus when the upload ID contains query parameters.
    68  		return "PUT", req.uploadPath() + "?digest=" + req.Digest
    69  	case ReqManifestGet:
    70  		return "GET", "/v2/" + req.Repo + "/manifests/" + req.tagOrDigest()
    71  	case ReqManifestHead:
    72  		return "HEAD", "/v2/" + req.Repo + "/manifests/" + req.tagOrDigest()
    73  	case ReqManifestPut:
    74  		return "PUT", "/v2/" + req.Repo + "/manifests/" + req.tagOrDigest()
    75  	case ReqManifestDelete:
    76  		return "DELETE", "/v2/" + req.Repo + "/manifests/" + req.tagOrDigest()
    77  	case ReqTagsList:
    78  		return "GET", "/v2/" + req.Repo + "/tags/list" + req.listParams()
    79  	case ReqReferrersList:
    80  		return "GET", "/v2/" + req.Repo + "/referrers/" + req.Digest
    81  	case ReqCatalogList:
    82  		return "GET", "/v2/_catalog" + req.listParams()
    83  	default:
    84  		panic("invalid request kind")
    85  	}
    86  }
    87  
    88  func (req *Request) uploadPath() string {
    89  	return "/v2/" + req.Repo + "/blobs/uploads/" + base64.RawURLEncoding.EncodeToString([]byte(req.UploadID))
    90  }
    91  
    92  func (req *Request) listParams() string {
    93  	q := make(url.Values)
    94  	if req.ListN >= 0 {
    95  		q.Set("n", fmt.Sprint(req.ListN))
    96  	}
    97  	if req.ListLast != "" {
    98  		q.Set("last", req.ListLast)
    99  	}
   100  	if len(q) > 0 {
   101  		return "?" + q.Encode()
   102  	}
   103  	return ""
   104  }
   105  
   106  func (req *Request) tagOrDigest() string {
   107  	if req.Tag != "" {
   108  		return req.Tag
   109  	}
   110  	return req.Digest
   111  }