forked from grafana/grafana
/
capabilities.go
57 lines (45 loc) · 1.87 KB
/
capabilities.go
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package rendering
import (
"context"
"errors"
"github.com/Masterminds/semver"
)
type Capability struct {
name CapabilityName
semverConstraint string
}
type CapabilityName string
const (
ScalingDownImages CapabilityName = "ScalingDownImages"
FullHeightImages CapabilityName = "FullHeightImages"
SvgSanitization CapabilityName = "SvgSanitization"
)
var ErrUnknownCapability = errors.New("unknown capability")
var ErrInvalidPluginVersion = errors.New("invalid plugin version")
func (rs *RenderingService) HasCapability(ctx context.Context, capability CapabilityName) (CapabilitySupportRequestResult, error) {
if !rs.IsAvailable(ctx) {
return CapabilitySupportRequestResult{IsSupported: false, SemverConstraint: ""}, ErrRenderUnavailable
}
var semverConstraint string
for i := range rs.capabilities {
if rs.capabilities[i].name == capability {
semverConstraint = rs.capabilities[i].semverConstraint
break
}
}
if semverConstraint == "" {
return CapabilitySupportRequestResult{}, ErrUnknownCapability
}
compiledSemverConstraint, err := semver.NewConstraint(semverConstraint)
if err != nil {
rs.log.Error("Failed to parse semver constraint", "constraint", semverConstraint, "capability", capability, "error", err.Error())
return CapabilitySupportRequestResult{IsSupported: false, SemverConstraint: semverConstraint}, ErrUnknownCapability
}
imageRendererVersion := rs.Version()
compiledImageRendererVersion, err := semver.NewVersion(imageRendererVersion)
if err != nil {
rs.log.Error("Failed to parse plugin version", "version", imageRendererVersion, "error", err.Error())
return CapabilitySupportRequestResult{IsSupported: false, SemverConstraint: semverConstraint}, ErrInvalidPluginVersion
}
return CapabilitySupportRequestResult{IsSupported: compiledSemverConstraint.Check(compiledImageRendererVersion), SemverConstraint: semverConstraint}, nil
}