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badge.go
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badge.go
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package badge
import (
"context"
"fmt"
"net/http"
"regexp"
"strings"
healthutil "github.com/argoproj/gitops-engine/pkg/health"
"k8s.io/apimachinery/pkg/api/errors"
validation "k8s.io/apimachinery/pkg/api/validation"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
appv1 "github.com/argoproj/argo-cd/v2/pkg/apis/application/v1alpha1"
"github.com/argoproj/argo-cd/v2/pkg/client/clientset/versioned"
"github.com/argoproj/argo-cd/v2/util/argo"
"github.com/argoproj/argo-cd/v2/util/assets"
"github.com/argoproj/argo-cd/v2/util/security"
"github.com/argoproj/argo-cd/v2/util/settings"
)
// NewHandler creates handler serving to do api/badge endpoint
func NewHandler(appClientset versioned.Interface, settingsMrg *settings.SettingsManager, namespace string, enabledNamespaces []string) http.Handler {
return &Handler{appClientset: appClientset, namespace: namespace, settingsMgr: settingsMrg, enabledNamespaces: enabledNamespaces}
}
// Handler used to get application in order to access health/sync
type Handler struct {
namespace string
appClientset versioned.Interface
settingsMgr *settings.SettingsManager
enabledNamespaces []string
}
var (
svgWidthPattern = regexp.MustCompile(`^<svg width="([^"]*)"`)
displayNonePattern = regexp.MustCompile(`display="none"`)
leftRectColorPattern = regexp.MustCompile(`id="leftRect" fill="([^"]*)"`)
rightRectColorPattern = regexp.MustCompile(`id="rightRect" fill="([^"]*)"`)
revisionRectColorPattern = regexp.MustCompile(`id="revisionRect" fill="([^"]*)"`)
leftTextPattern = regexp.MustCompile(`id="leftText" [^>]*>([^<]*)`)
rightTextPattern = regexp.MustCompile(`id="rightText" [^>]*>([^<]*)`)
revisionTextPattern = regexp.MustCompile(`id="revisionText" [^>]*>([^<]*)`)
titleTextPattern = regexp.MustCompile(`id="titleText" [^>]*>([^<]*)`)
titleRectWidthPattern = regexp.MustCompile(`(id="titleRect" .* width=)("0")`)
rightRectWidthPattern = regexp.MustCompile(`(id="rightRect" .* width=)("\d*")`)
leftRectYCoodPattern = regexp.MustCompile(`(id="leftRect" .* y=)("\d*")`)
rightRectYCoodPattern = regexp.MustCompile(`(id="rightRect" .* y=)("\d*")`)
revisionRectYCoodPattern = regexp.MustCompile(`(id="revisionRect" .* y=)("\d*")`)
leftTextYCoodPattern = regexp.MustCompile(`(id="leftText" .* y=)("\d*")`)
rightTextYCoodPattern = regexp.MustCompile(`(id="rightText" .* y=)("\d*")`)
revisionTextYCoodPattern = regexp.MustCompile(`(id="revisionText" .* y=)("\d*")`)
svgHeightPattern = regexp.MustCompile(`^(<svg .* height=)("\d*")`)
logoYCoodPattern = regexp.MustCompile(`(<image .* y=)("\d*")`)
)
const (
svgWidthWithRevision = 192
svgWidthWithoutRevision = 131
svgHeightWithAppName = 40
badgeRowHeight = 20
statusRowYCoodWithAppName = 330
logoYCoodWithAppName = 22
leftRectWidth = 77
widthPerChar = 6
)
func replaceFirstGroupSubMatch(re *regexp.Regexp, str string, repl string) string {
result := ""
lastIndex := 0
for _, v := range re.FindAllSubmatchIndex([]byte(str), -1) {
groups := []string{}
for i := 0; i < len(v); i += 2 {
groups = append(groups, str[v[i]:v[i+1]])
}
result += str[lastIndex:v[0]] + groups[0] + repl
lastIndex = v[1]
}
return result + str[lastIndex:]
}
// ServeHTTP returns badge with health and sync status for application
// (or an error badge if wrong query or application name is given)
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
health := healthutil.HealthStatusUnknown
status := appv1.SyncStatusCodeUnknown
revision := ""
applicationName := ""
revisionEnabled := false
enabled := false
displayAppName := false
notFound := false
svgWidth := svgWidthWithoutRevision
if sets, err := h.settingsMgr.GetSettings(); err == nil {
enabled = sets.StatusBadgeEnabled
}
reqNs := ""
if ns, ok := r.URL.Query()["namespace"]; ok && enabled {
if argo.IsValidNamespaceName(ns[0]) {
if security.IsNamespaceEnabled(ns[0], h.namespace, h.enabledNamespaces) {
reqNs = ns[0]
} else {
notFound = true
}
} else {
w.WriteHeader(http.StatusBadRequest)
return
}
} else {
reqNs = h.namespace
}
//Sample url: http://localhost:8080/api/badge?name=123
if name, ok := r.URL.Query()["name"]; ok && enabled && !notFound {
if argo.IsValidAppName(name[0]) {
if app, err := h.appClientset.ArgoprojV1alpha1().Applications(reqNs).Get(context.Background(), name[0], v1.GetOptions{}); err == nil {
health = app.Status.Health.Status
status = app.Status.Sync.Status
applicationName = name[0]
if app.Status.OperationState != nil && app.Status.OperationState.SyncResult != nil {
revision = app.Status.OperationState.SyncResult.Revision
}
} else {
if errors.IsNotFound(err) {
notFound = true
}
}
} else {
w.WriteHeader(http.StatusBadRequest)
return
}
}
//Sample url: http://localhost:8080/api/badge?project=default
if projects, ok := r.URL.Query()["project"]; ok && enabled && !notFound {
for _, p := range projects {
if errs := validation.NameIsDNSLabel(strings.ToLower(p), false); len(p) > 0 && len(errs) != 0 {
w.WriteHeader(http.StatusBadRequest)
return
}
}
if apps, err := h.appClientset.ArgoprojV1alpha1().Applications(reqNs).List(context.Background(), v1.ListOptions{}); err == nil {
applicationSet := argo.FilterByProjects(apps.Items, projects)
for _, a := range applicationSet {
if a.Status.Sync.Status != appv1.SyncStatusCodeSynced {
status = appv1.SyncStatusCodeOutOfSync
}
if a.Status.Health.Status != healthutil.HealthStatusHealthy {
health = healthutil.HealthStatusDegraded
}
}
if health != healthutil.HealthStatusDegraded && len(applicationSet) > 0 {
health = healthutil.HealthStatusHealthy
}
if status != appv1.SyncStatusCodeOutOfSync && len(applicationSet) > 0 {
status = appv1.SyncStatusCodeSynced
}
}
}
//Sample url: http://localhost:8080/api/badge?name=123&revision=true
if revisionParam, ok := r.URL.Query()["revision"]; ok && enabled && strings.EqualFold(revisionParam[0], "true") {
revisionEnabled = true
}
leftColorString := ""
if leftColor, ok := HealthStatusColors[health]; ok {
leftColorString = toRGBString(leftColor)
} else {
leftColorString = toRGBString(Grey)
}
rightColorString := ""
if rightColor, ok := SyncStatusColors[status]; ok {
rightColorString = toRGBString(rightColor)
} else {
rightColorString = toRGBString(Grey)
}
leftText := string(health)
rightText := string(status)
if notFound {
leftText = "Not Found"
rightText = ""
}
badge := assets.BadgeSVG
badge = leftRectColorPattern.ReplaceAllString(badge, fmt.Sprintf(`id="leftRect" fill="%s" $2`, leftColorString))
badge = rightRectColorPattern.ReplaceAllString(badge, fmt.Sprintf(`id="rightRect" fill="%s" $2`, rightColorString))
badge = replaceFirstGroupSubMatch(leftTextPattern, badge, leftText)
badge = replaceFirstGroupSubMatch(rightTextPattern, badge, rightText)
if !notFound && revisionEnabled && revision != "" {
// Increase width of SVG and enable display of revision components
badge = svgWidthPattern.ReplaceAllString(badge, fmt.Sprintf(`<svg width="%d" $2`, svgWidthWithRevision))
svgWidth = svgWidthWithRevision
badge = displayNonePattern.ReplaceAllString(badge, `display="inline"`)
badge = revisionRectColorPattern.ReplaceAllString(badge, fmt.Sprintf(`id="revisionRect" fill="%s" $2`, rightColorString))
shortRevision := revision
if len(shortRevision) > 7 {
shortRevision = shortRevision[:7]
}
badge = replaceFirstGroupSubMatch(revisionTextPattern, badge, fmt.Sprintf("(%s)", shortRevision))
}
if showAppNameParam, ok := r.URL.Query()["showAppName"]; ok && enabled && strings.EqualFold(showAppNameParam[0], "true") {
displayAppName = true
}
if displayAppName && applicationName != "" {
titleRectWidth := len(applicationName) * widthPerChar
var longerWidth int = max(titleRectWidth, svgWidth)
rightRectWidth := longerWidth - leftRectWidth
fmt.Println(len(applicationName))
badge = titleRectWidthPattern.ReplaceAllString(badge, fmt.Sprintf(`$1"%d"`, longerWidth))
badge = rightRectWidthPattern.ReplaceAllString(badge, fmt.Sprintf(`$1"%d"`, rightRectWidth))
badge = replaceFirstGroupSubMatch(titleTextPattern, badge, applicationName)
badge = leftRectYCoodPattern.ReplaceAllString(badge, fmt.Sprintf(`$1"%d"`, badgeRowHeight))
badge = rightRectYCoodPattern.ReplaceAllString(badge, fmt.Sprintf(`$1"%d"`, badgeRowHeight))
badge = revisionRectYCoodPattern.ReplaceAllString(badge, fmt.Sprintf(`$1"%d"`, badgeRowHeight))
badge = leftTextYCoodPattern.ReplaceAllString(badge, fmt.Sprintf(`$1"%d"`, statusRowYCoodWithAppName))
badge = rightTextYCoodPattern.ReplaceAllString(badge, fmt.Sprintf(`$1"%d"`, statusRowYCoodWithAppName))
badge = revisionTextYCoodPattern.ReplaceAllString(badge, fmt.Sprintf(`$1"%d"`, statusRowYCoodWithAppName))
badge = svgHeightPattern.ReplaceAllString(badge, fmt.Sprintf(`$1"%d"`, svgHeightWithAppName))
badge = logoYCoodPattern.ReplaceAllString(badge, fmt.Sprintf(`$1"%d"`, logoYCoodWithAppName))
badge = svgWidthPattern.ReplaceAllString(badge, fmt.Sprintf(`<svg width="%d" $2`, longerWidth))
}
w.Header().Set("Content-Type", "image/svg+xml")
//Ask cache's to not cache the contents in order prevent the badge from becoming stale
w.Header().Set("Cache-Control", "private, no-store")
//Allow badges to be fetched via XHR from frontend applications without running into CORS issues
w.Header().Set("Access-Control-Allow-Origin", "*")
w.WriteHeader(http.StatusOK)
_, _ = w.Write([]byte(badge))
}