api: rename /api/versions to versionsapi and /api/attestationcfig to attestationconfigapi (#1876)

* rename to attestationconfigapi + put client and fetcher inside pkg

* rename api/version to versionsapi and put fetcher + client inside pkg

* rename AttestationConfigAPIFetcher to Fetcher

internal/api/attestationconfigapi/azure.go

@@ -0,0 +1,132 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package attestationconfigapi
+
+import (
+	"fmt"
+	"net/url"
+	"path"
+	"strings"
+
+	"github.com/edgelesssys/constellation/v2/internal/constants"
+	"github.com/edgelesssys/constellation/v2/internal/variant"
+)
+
+// attestationURLPath is the URL path to the attestation versions.
+const attestationURLPath = "constellation/v1/attestation"
+
+// AzureSEVSNPVersionType is the type of the version to be requested.
+type AzureSEVSNPVersionType string
+
+// AzureSEVSNPVersion tracks the latest version of each component of the Azure SEVSNP.
+type AzureSEVSNPVersion struct {
+	// Bootloader is the latest version of the Azure SEVSNP bootloader.
+	Bootloader uint8 `json:"bootloader"`
+	// TEE is the latest version of the Azure SEVSNP TEE.
+	TEE uint8 `json:"tee"`
+	// SNP is the latest version of the Azure SEVSNP SNP.
+	SNP uint8 `json:"snp"`
+	// Microcode is the latest version of the Azure SEVSNP microcode.
+	Microcode uint8 `json:"microcode"`
+}
+
+// AzureSEVSNPVersionSignature is the object to perform CRUD operations on the config api.
+type AzureSEVSNPVersionSignature struct {
+	Version   string `json:"-"`
+	Signature []byte `json:"signature"`
+}
+
+// JSONPath returns the path to the JSON file for the request to the config api.
+func (s AzureSEVSNPVersionSignature) JSONPath() string {
+	return path.Join(attestationURLPath, variant.AzureSEVSNP{}.String(), s.Version+".sig")
+}
+
+// URL returns the URL for the request to the config api.
+func (s AzureSEVSNPVersionSignature) URL() (string, error) {
+	return getURL(s)
+}
+
+// ValidateRequest validates the request.
+func (s AzureSEVSNPVersionSignature) ValidateRequest() error {
+	if !strings.HasSuffix(s.Version, ".json") {
+		return fmt.Errorf("%s version has no .json suffix", s.Version)
+	}
+	return nil
+}
+
+// Validate is a No-Op at the moment.
+func (s AzureSEVSNPVersionSignature) Validate() error {
+	return nil
+}
+
+// AzureSEVSNPVersionAPI is the request to get the version information of the specific version in the config api.
+type AzureSEVSNPVersionAPI struct {
+	Version string `json:"-"`
+	AzureSEVSNPVersion
+}
+
+// URL returns the URL for the request to the config api.
+func (i AzureSEVSNPVersionAPI) URL() (string, error) {
+	return getURL(i)
+}
+
+// JSONPath returns the path to the JSON file for the request to the config api.
+func (i AzureSEVSNPVersionAPI) JSONPath() string {
+	return path.Join(attestationURLPath, variant.AzureSEVSNP{}.String(), i.Version)
+}
+
+// ValidateRequest validates the request.
+func (i AzureSEVSNPVersionAPI) ValidateRequest() error {
+	if !strings.HasSuffix(i.Version, ".json") {
+		return fmt.Errorf("version has no .json suffix")
+	}
+	return nil
+}
+
+// Validate is a No-Op at the moment.
+func (i AzureSEVSNPVersionAPI) Validate() error {
+	return nil
+}
+
+// AzureSEVSNPVersionList is the request to list all versions in the config api.
+type AzureSEVSNPVersionList []string
+
+// URL returns the URL for the request to the config api.
+func (i AzureSEVSNPVersionList) URL() (string, error) {
+	return getURL(i)
+}
+
+// JSONPath returns the path to the JSON file for the request to the config api.
+func (i AzureSEVSNPVersionList) JSONPath() string {
+	return path.Join(attestationURLPath, variant.AzureSEVSNP{}.String(), "list")
+}
+
+// ValidateRequest is a NoOp as there is no input.
+func (i AzureSEVSNPVersionList) ValidateRequest() error {
+	return nil
+}
+
+// Validate validates the response.
+func (i AzureSEVSNPVersionList) Validate() error {
+	if len(i) < 1 {
+		return fmt.Errorf("no versions found in /list")
+	}
+	return nil
+}
+
+func getURL(obj jsoPather) (string, error) {
+	url, err := url.Parse(constants.CDNRepositoryURL)
+	if err != nil {
+		return "", fmt.Errorf("parsing CDN URL: %w", err)
+	}
+	url.Path = obj.JSONPath()
+	return url.String(), nil
+}
+
+type jsoPather interface {
+	JSONPath() string
+}