Add the httpsprovider component (#6683)

* Feat: add httpsprovider component

Add the httpsprovider component that allows the collector to fetch
configuration from a web server using the https protocol.

Signed-off-by: Raphael Silva <rapphil@gmail.com>

* Add httpsprovider to the list of config providers

Signed-off-by: Raphael Silva <rapphil@gmail.com>

* Update README

Signed-off-by: Raphael Silva <rapphil@gmail.com>

* Apply suggestions from code review

Co-authored-by: Pablo Baeyens <pbaeyens31+github@gmail.com>

* Improve unit tests

Improve unit tests to check for error while parsing test URL.

Co-authored-by: Pablo Baeyens <pbaeyens31+github@gmail.com>

* Fix comments

Co-authored-by: Anthony Mirabella <a9@aneurysm9.com>

* Fix comments

Co-authored-by: Anthony Mirabella <a9@aneurysm9.com>

* Use SchemeType instead of TransportType

Signed-off-by: Raphael Silva <rapphil@gmail.com>

* Refactor to improve readability

Signed-off-by: Raphael Silva <rapphil@gmail.com>

* Use consts from http to set http status code

Signed-off-by: Raphael Silva <rapphil@gmail.com>

* Refactor code organization

Signed-off-by: Raphael Silva <rapphil@gmail.com>

* Use struct with zero initialized properties

Signed-off-by: Raphael Silva <rapphil@gmail.com>

Signed-off-by: Raphael Silva <rapphil@gmail.com>
Co-authored-by: Pablo Baeyens <pbaeyens31+github@gmail.com>
Co-authored-by: Anthony Mirabella <a9@aneurysm9.com>

.chloggen/add-https-httpprovider.yaml

@@ -0,0 +1,16 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: new_component
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: httpsprovider
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add the httpsprovider. This component allows the collector to fetch configurations from web servers using the HTTPS protocol.
+
+# One or more tracking issues or pull requests related to the change
+issues: [6683]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:

confmap/provider/httpprovider/provider.go

@@ -15,66 +15,15 @@
 package httpprovider // import "go.opentelemetry.io/collector/confmap/provider/httpprovider"
 
 import (
-	"context"
-	"fmt"
-	"io"
-	"net/http"
-	"strings"
-
 	"go.opentelemetry.io/collector/confmap"
-	"go.opentelemetry.io/collector/confmap/provider/internal"
-)
-
-const (
-	schemeName = "http"
+	"go.opentelemetry.io/collector/confmap/provider/internal/configurablehttpprovider"
 )
 
-type provider struct {
-	client http.Client
-}
-
-// New returns a new confmap.Provider that reads the configuration from a file.
-//
-// This Provider supports "http" scheme, and can be called with a "uri" that follows:
+// New returns a new confmap.Provider that reads the configuration from a http server.
 //
-// One example for http-uri be like: http://localhost:3333/getConfig
+// This Provider supports "http" scheme.
 //
-// Examples:
-// `http://localhost:3333/getConfig` - (unix, windows)
+// One example for HTTP URI is: http://localhost:3333/getConfig
 func New() confmap.Provider {
-	return &provider{client: http.Client{}}
-}
-
-func (fmp *provider) Retrieve(_ context.Context, uri string, _ confmap.WatcherFunc) (*confmap.Retrieved, error) {
-	if !strings.HasPrefix(uri, schemeName+":") {
-		return nil, fmt.Errorf("%q uri is not supported by %q provider", uri, schemeName)
-	}
-
-	// send a HTTP GET request
-	resp, err := fmp.client.Get(uri)
-	if err != nil {
-		return nil, fmt.Errorf("unable to download the file via HTTP GET for uri %q, with err: %w ", uri, err)
-	}
-	defer resp.Body.Close()
-
-	// check the HTTP status code
-	if resp.StatusCode != 200 {
-		return nil, fmt.Errorf("404: resource didn't exist, fail to read the response body from uri %q", uri)
-	}
-
-	// read the response body
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return nil, fmt.Errorf("fail to read the response body from uri %q, with err: %w ", uri, err)
-	}
-
-	return internal.NewRetrievedFromYAML(body)
-}
-
-func (*provider) Scheme() string {
-	return schemeName
-}
-
-func (*provider) Shutdown(context.Context) error {
-	return nil
+	return configurablehttpprovider.New(configurablehttpprovider.HTTPScheme)
 }

confmap/provider/httpprovider/provider_test.go

@@ -16,101 +16,14 @@ package httpprovider
 
 import (
 	"context"
-	"fmt"
-	"net/http"
-	"net/http/httptest"
-	"os"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-
-	"go.opentelemetry.io/collector/confmap/confmaptest"
 )
 
-func TestFunctionalityDownloadFileHTTP(t *testing.T) {
-	fp := New()
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		f, err := os.ReadFile("./testdata/otel-config.yaml")
-		if err != nil {
-			w.WriteHeader(404)
-			_, innerErr := w.Write([]byte("Cannot find the config file"))
-			if innerErr != nil {
-				fmt.Println("Write failed: ", innerErr)
-			}
-			return
-		}
-		w.WriteHeader(200)
-		_, err = w.Write(f)
-		if err != nil {
-			fmt.Println("Write failed: ", err)
-		}
-	}))
-	defer ts.Close()
-	_, err := fp.Retrieve(context.Background(), ts.URL, nil)
-	assert.NoError(t, err)
-	assert.NoError(t, fp.Shutdown(context.Background()))
-}
-
-func TestUnsupportedScheme(t *testing.T) {
-	fp := New()
-	_, err := fp.Retrieve(context.Background(), "https://...", nil)
-	assert.Error(t, err)
-	assert.NoError(t, fp.Shutdown(context.Background()))
-}
-
-func TestEmptyURI(t *testing.T) {
-	fp := New()
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.WriteHeader(400)
-	}))
-	defer ts.Close()
-	_, err := fp.Retrieve(context.Background(), ts.URL, nil)
-	require.Error(t, err)
-	require.NoError(t, fp.Shutdown(context.Background()))
-}
-
-func TestRetrieveFromShutdownServer(t *testing.T) {
-	fp := New()
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
-	ts.Close()
-	_, err := fp.Retrieve(context.Background(), ts.URL, nil)
-	assert.Error(t, err)
-	require.NoError(t, fp.Shutdown(context.Background()))
-}
-
-func TestNonExistent(t *testing.T) {
-	fp := New()
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.WriteHeader(404)
-	}))
-	defer ts.Close()
-	_, err := fp.Retrieve(context.Background(), ts.URL, nil)
-	assert.Error(t, err)
-	require.NoError(t, fp.Shutdown(context.Background()))
-}
-
-func TestInvalidYAML(t *testing.T) {
-	fp := New()
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.WriteHeader(200)
-		_, err := w.Write([]byte("wrong : ["))
-		if err != nil {
-			fmt.Println("Write failed: ", err)
-		}
-	}))
-	defer ts.Close()
-	_, err := fp.Retrieve(context.Background(), ts.URL, nil)
-	assert.Error(t, err)
-	require.NoError(t, fp.Shutdown(context.Background()))
-}
-
-func TestScheme(t *testing.T) {
+func TestSupportedScheme(t *testing.T) {
 	fp := New()
 	assert.Equal(t, "http", fp.Scheme())
 	require.NoError(t, fp.Shutdown(context.Background()))
 }
-
-func TestValidateProviderScheme(t *testing.T) {
-	assert.NoError(t, confmaptest.ValidateProviderScheme(New()))
-}

confmap/provider/httpsprovider/README.md

@@ -0,0 +1,18 @@
+### What is the httpsprovider?
+
+An implementation of `confmap.Provider` for HTTPS (httpsprovider) allows OTEL Collector to use the HTTPS protocol to
+load configuration files stored in web servers.
+
+Expected URI format:
+- https://...
+
+### Prerequistes
+
+You need to setup a HTTP server with support to HTTPS. The server must have a certificate that can be validated in the
+host running the collector using system root certificates.
+
+### Configuration
+
+At this moment, this component only support communicating with servers whose certificate can be verified using the root
+CA certificates installed in the system. The process of adding more root CA certificates to the system is operating
+system dependent. For Linux, please refer to the `update-ca-trust` command.

confmap/provider/httpsprovider/provider.go

@@ -0,0 +1,30 @@
+// Copyright The OpenTelemetry Authors
+//
+// 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 httpsprovider // import "go.opentelemetry.io/collector/confmap/provider/httpsprovider"
+
+import (
+	"go.opentelemetry.io/collector/confmap"
+	"go.opentelemetry.io/collector/confmap/provider/internal/configurablehttpprovider"
+)
+
+// New returns a new confmap.Provider that reads the configuration from a https server.
+//
+// This Provider supports "https" scheme. One example of an HTTPS URI is: https://localhost:3333/getConfig
+//
+// To add extra CA certificates you need to install certificates in the system pool. This procedure is operating system
+// dependent. E.g.: on Linux please refer to the `update-ca-trust` command.
+func New() confmap.Provider {
+	return configurablehttpprovider.New(configurablehttpprovider.HTTPSScheme)
+}

confmap/provider/httpsprovider/provider_test.go

@@ -0,0 +1,26 @@
+// Copyright The OpenTelemetry Authors
+//
+// 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 httpsprovider
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSupportedScheme(t *testing.T) {
+	fp := New()
+	assert.Equal(t, "https", fp.Scheme())
+}