feat: Archivista HTTP client

add a pkg with a HTTP client for Archivista using the pkg API

Signed-off-by: Kairo Araujo <[email protected]>

pkg/http-client/client.go

@@ -0,0 +1,181 @@
+// Copyright 2024 The Archivista Contributors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package httpclient
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+
+	"github.com/in-toto/archivista/pkg/api"
+	"github.com/in-toto/go-witness/dsse"
+)
+
+type ArchivistaClient struct {
+	BaseURL    string
+	GraphQLURL string
+	*http.Client
+}
+
+func CreateArchivistaClient(httpClient *http.Client, baseURL string) (*ArchivistaClient, error) {
+	client := ArchivistaClient{
+		BaseURL: baseURL,
+		Client:  http.DefaultClient,
+	}
+	if httpClient != nil {
+		client.Client = httpClient
+	}
+	var err error
+	client.GraphQLURL, err = url.JoinPath(client.BaseURL, "query")
+	if err != nil {
+		return nil, err
+	}
+	return &client, nil
+}
+
+func (ac *ArchivistaClient) DownloadDSSE(ctx context.Context, gitoid string) (dsse.Envelope, error) {
+	reader, err := api.DownloadReadCloserWithHTTPClient(ctx, ac.Client, ac.BaseURL, gitoid)
+	if err != nil {
+		return dsse.Envelope{}, err
+	}
+	env := dsse.Envelope{}
+	if err := json.NewDecoder(reader).Decode(&env); err != nil {
+		return dsse.Envelope{}, err
+	}
+	return env, nil
+}
+
+func (ac *ArchivistaClient) DownloadReadCloser(ctx context.Context, gitoid string) (io.ReadCloser, error) {
+	return api.DownloadReadCloserWithHTTPClient(ctx, ac.Client, ac.BaseURL, gitoid)
+}
+
+func (ac *ArchivistaClient) DownloadWithWriter(ctx context.Context, gitoid string, dst io.Writer) error {
+	return api.DownloadWithWriterWithHTTPClient(ctx, ac.Client, ac.BaseURL, gitoid, dst)
+}
+
+func (ac *ArchivistaClient) Store(ctx context.Context, envelope dsse.Envelope) (api.StoreResponse, error) {
+	return api.Store(ctx, ac.BaseURL, envelope)
+}
+
+func (ac *ArchivistaClient) StoreWithReader(ctx context.Context, r io.Reader) (api.StoreResponse, error) {
+	return api.StoreWithReader(ctx, ac.BaseURL, r)
+}
+
+type GraphQLRequestBodyInterface struct {
+	Query     string      `json:"query"`
+	Variables interface{} `json:"variables,omitempty"`
+}
+
+type GraphQLResponseInterface struct {
+	Data   interface{}
+	Errors []api.GraphQLError `json:"errors,omitempty"`
+}
+
+func (ac *ArchivistaClient) GraphQLRetrieveSubjectResults(
+	ctx context.Context,
+	gitoid string,
+) (api.RetrieveSubjectResults, error) {
+	return api.GraphQlQuery[api.RetrieveSubjectResults](
+		ctx,
+		ac.BaseURL,
+		api.RetrieveSubjectsQuery,
+		api.RetrieveSubjectVars{Gitoid: gitoid},
+	)
+}
+
+func (ac *ArchivistaClient) GraphQLRetrieveSearchResults(
+	ctx context.Context,
+	algo string,
+	digest string,
+) (api.SearchResults, error) {
+	return api.GraphQlQuery[api.SearchResults](
+		ctx,
+		ac.BaseURL,
+		api.SearchQuery,
+		api.SearchVars{Algorithm: algo, Digest: digest},
+	)
+}
+
+func (ac *ArchivistaClient) GraphQLQueryIface(
+	ctx context.Context,
+	query string,
+	variables interface{},
+) (*GraphQLResponseInterface, error) {
+	reader, err := ac.GraphQLQueryReadCloser(ctx, query, variables)
+	if err != nil {
+		return nil, err
+	}
+	defer reader.Close()
+	gqlRes := GraphQLResponseInterface{}
+	dec := json.NewDecoder(reader)
+	if err := dec.Decode(&gqlRes); err != nil {
+		return nil, err
+	}
+	if len(gqlRes.Errors) > 0 {
+		return nil, fmt.Errorf("graph ql query failed: %v", gqlRes.Errors)
+	}
+	return &gqlRes, nil
+}
+
+func (ac *ArchivistaClient) GraphQLQueryToDst(ctx context.Context, query string, variables interface{}, dst interface{}) error {
+	reader, err := ac.GraphQLQueryReadCloser(ctx, query, variables)
+	if err != nil {
+		return err
+	}
+	defer reader.Close()
+	dec := json.NewDecoder(reader)
+	if err := dec.Decode(&dst); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (ac *ArchivistaClient) GraphQLQueryReadCloser(
+	ctx context.Context,
+	query string,
+	variables interface{},
+) (io.ReadCloser, error) {
+	requestBodyMap := GraphQLRequestBodyInterface{
+		Query:     query,
+		Variables: variables,
+	}
+	requestBodyJSON, err := json.Marshal(requestBodyMap)
+	if err != nil {
+		return nil, err
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, ac.GraphQLURL, bytes.NewReader(requestBodyJSON))
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	res, err := ac.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	if res.StatusCode != http.StatusOK {
+		defer res.Body.Close()
+		errMsg, err := io.ReadAll(res.Body)
+		if err != nil {
+			return nil, err
+		}
+		return nil, errors.New(string(errMsg))
+	}
+	return res.Body, nil
+}