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static.go
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static.go
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// Copyright 2018-2021 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package static
import (
"container/heap"
"context"
"fmt"
"strconv"
"strings"
"sync"
registrypb "github.com/cs3org/go-cs3apis/cs3/app/registry/v1beta1"
"github.com/cs3org/reva/pkg/app"
"github.com/cs3org/reva/pkg/app/registry/registry"
"github.com/cs3org/reva/pkg/errtypes"
"github.com/mitchellh/mapstructure"
"github.com/rs/zerolog/log"
orderedmap "github.com/wk8/go-ordered-map"
)
func init() {
registry.Register("static", New)
}
const defaultPriority = 0
type mimeTypeConfig struct {
MimeType string `mapstructure:"mime_type"`
Extension string `mapstructure:"extension"`
Name string `mapstructure:"name"`
Description string `mapstructure:"description"`
Icon string `mapstructure:"icon"`
DefaultApp string `mapstructure:"default_app"`
AllowCreation bool `mapstructure:"allow_creation"`
apps providerHeap
}
type config struct {
Providers []*registrypb.ProviderInfo `mapstructure:"providers"`
MimeTypes []*mimeTypeConfig `mapstructure:"mime_types"`
}
func (c *config) init() {
if len(c.Providers) == 0 {
c.Providers = []*registrypb.ProviderInfo{}
}
}
func parseConfig(m map[string]interface{}) (*config, error) {
c := &config{}
if err := mapstructure.Decode(m, c); err != nil {
return nil, err
}
return c, nil
}
type manager struct {
providers map[string]*registrypb.ProviderInfo
mimetypes *orderedmap.OrderedMap // map[string]*mimeTypeConfig -> map the mime type to the addresses of the corresponding providers
sync.RWMutex
}
// New returns an implementation of the app.Registry interface.
func New(m map[string]interface{}) (app.Registry, error) {
c, err := parseConfig(m)
if err != nil {
return nil, err
}
c.init()
mimetypes := orderedmap.New()
for _, mime := range c.MimeTypes {
mimetypes.Set(mime.MimeType, mime)
}
providerMap := make(map[string]*registrypb.ProviderInfo)
for _, p := range c.Providers {
providerMap[p.Address] = p
}
// register providers configured manually from the config
// (different from the others that are registering themselves -
// dinamically added invoking the AddProvider function)
for _, p := range c.Providers {
if p != nil {
for _, m := range p.MimeTypes {
if v, ok := mimetypes.Get(m); ok {
mtc := v.(*mimeTypeConfig)
registerProvider(p, mtc)
} else {
return nil, errtypes.NotFound(fmt.Sprintf("mimetype %s not found in the configuration", m))
}
}
}
}
newManager := manager{
providers: providerMap,
mimetypes: mimetypes,
}
return &newManager, nil
}
// remove a provider from the provider list in a mime type
// it's a no-op if the provider is not in the list of providers in the mime type
func unregisterProvider(p *registrypb.ProviderInfo, mime *mimeTypeConfig) {
if index, in := getIndex(mime.apps, p); in {
// remove the provider from the list
heap.Remove(&mime.apps, index)
}
}
func registerProvider(p *registrypb.ProviderInfo, mime *mimeTypeConfig) {
// the app provider could be previously registered to the same mime type list
// so we will remove it
unregisterProvider(p, mime)
heap.Push(&mime.apps, providerWithPriority{
provider: p,
priority: getPriority(p),
})
}
func getPriority(p *registrypb.ProviderInfo) uint64 {
if p.Opaque != nil && len(p.Opaque.Map) != 0 {
if priority, ok := p.Opaque.Map["priority"]; ok {
if pr, err := strconv.ParseUint(string(priority.GetValue()), 10, 64); err == nil {
return pr
}
}
}
return defaultPriority
}
func (m *manager) FindProviders(ctx context.Context, mimeType string) ([]*registrypb.ProviderInfo, error) {
// find longest match
var match string
m.RLock()
defer m.RUnlock()
for pair := m.mimetypes.Oldest(); pair != nil; pair = pair.Next() {
prefix := pair.Key.(string)
if strings.HasPrefix(mimeType, prefix) && len(prefix) > len(match) {
match = prefix
}
}
if match == "" {
return nil, errtypes.NotFound("application provider not found for mime type " + mimeType)
}
mimeInterface, _ := m.mimetypes.Get(match)
mimeMatch := mimeInterface.(*mimeTypeConfig)
var providers = make([]*registrypb.ProviderInfo, 0, len(mimeMatch.apps))
for _, p := range mimeMatch.apps {
providers = append(providers, m.providers[p.provider.Address])
}
return providers, nil
}
func (m *manager) AddProvider(ctx context.Context, p *registrypb.ProviderInfo) error {
m.Lock()
defer m.Unlock()
// check if the provider was already registered
// if it's the case, we have to unregister it
// from all the old mime types
if oldP, ok := m.providers[p.Address]; ok {
oldMimeTypes := oldP.MimeTypes
for _, mimeName := range oldMimeTypes {
mimeIf, ok := m.mimetypes.Get(mimeName)
if !ok {
continue
}
mime := mimeIf.(*mimeTypeConfig)
unregisterProvider(p, mime)
}
}
m.providers[p.Address] = p
for _, mime := range p.MimeTypes {
if mimeTypeInterface, ok := m.mimetypes.Get(mime); ok {
mimeType := mimeTypeInterface.(*mimeTypeConfig)
registerProvider(p, mimeType)
} else {
// the mime type should be already registered as config in the AppRegistry
// we will create a new entry fot the mimetype, but leaving a warning for
// future log inspection for weird behaviour
// log.Warn().Msgf("config for mimetype '%s' not found while adding a new AppProvider", m)
m.mimetypes.Set(mime, dummyMimeType(mime, []*registrypb.ProviderInfo{p}))
}
}
return nil
}
func (m *manager) ListProviders(ctx context.Context) ([]*registrypb.ProviderInfo, error) {
m.RLock()
defer m.RUnlock()
providers := make([]*registrypb.ProviderInfo, 0, len(m.providers))
for _, p := range m.providers {
providers = append(providers, p)
}
return providers, nil
}
func (m *manager) ListSupportedMimeTypes(ctx context.Context) ([]*registrypb.MimeTypeInfo, error) {
m.RLock()
defer m.RUnlock()
res := make([]*registrypb.MimeTypeInfo, 0, m.mimetypes.Len())
for pair := m.mimetypes.Oldest(); pair != nil; pair = pair.Next() {
mime := pair.Value.(*mimeTypeConfig)
res = append(res, ®istrypb.MimeTypeInfo{
MimeType: mime.MimeType,
Ext: mime.Extension,
Name: mime.Name,
Description: mime.Description,
Icon: mime.Icon,
AppProviders: mime.apps.getOrderedProviderByPriority(),
AllowCreation: mime.AllowCreation,
DefaultApplication: mime.DefaultApp,
})
}
return res, nil
}
func (h providerHeap) getOrderedProviderByPriority() []*registrypb.ProviderInfo {
providers := make([]*registrypb.ProviderInfo, 0, h.Len())
for _, pp := range h {
providers = append(providers, pp.provider)
}
return providers
}
func getIndex(h providerHeap, s *registrypb.ProviderInfo) (int, bool) {
for i, e := range h {
if equalsProviderInfo(e.provider, s) {
return i, true
}
}
return -1, false
}
func (m *manager) SetDefaultProviderForMimeType(ctx context.Context, mimeType string, p *registrypb.ProviderInfo) error {
m.Lock()
defer m.Unlock()
mimeInterface, ok := m.mimetypes.Get(mimeType)
if ok {
mime := mimeInterface.(*mimeTypeConfig)
mime.DefaultApp = p.Address
registerProvider(p, mime)
} else {
// the mime type should be already registered as config in the AppRegistry
// we will create a new entry fot the mimetype, but leaving a warning for
// future log inspection for weird behaviour
log.Warn().Msgf("config for mimetype '%s' not found while setting a new default AppProvider", mimeType)
m.mimetypes.Set(mimeType, dummyMimeType(mimeType, []*registrypb.ProviderInfo{p}))
}
return nil
}
func dummyMimeType(m string, apps []*registrypb.ProviderInfo) *mimeTypeConfig {
appsHeap := providerHeap{}
for _, p := range apps {
heap.Push(&appsHeap, providerWithPriority{
provider: p,
priority: getPriority(p),
})
}
return &mimeTypeConfig{
MimeType: m,
apps: appsHeap,
//Extension: "", // there is no meaningful general extension, so omit it
//Name: "", // there is no meaningful general name, so omit it
//Description: "", // there is no meaningful general description, so omit it
}
}
func (m *manager) GetDefaultProviderForMimeType(ctx context.Context, mimeType string) (*registrypb.ProviderInfo, error) {
m.RLock()
defer m.RUnlock()
mimeInterface, ok := m.mimetypes.Get(mimeType)
if ok {
mime := mimeInterface.(*mimeTypeConfig)
// default by provider address
if p, ok := m.providers[mime.DefaultApp]; ok {
return p, nil
}
// default by provider name
for _, p := range m.providers {
if p.Name == mime.DefaultApp {
return p, nil
}
}
}
return nil, errtypes.NotFound("default application provider not set for mime type " + mimeType)
}
func equalsProviderInfo(p1, p2 *registrypb.ProviderInfo) bool {
return p1.Name == p2.Name
}
// check that all providers in the two lists are equals
func providersEquals(l1, l2 []*registrypb.ProviderInfo) bool {
if len(l1) != len(l2) {
return false
}
for i := 0; i < len(l1); i++ {
if !equalsProviderInfo(l1[i], l2[i]) {
return false
}
}
return true
}
type providerWithPriority struct {
provider *registrypb.ProviderInfo
priority uint64
}
type providerHeap []providerWithPriority
func (h providerHeap) Len() int {
return len(h)
}
func (h providerHeap) Less(i, j int) bool {
return h[i].priority > h[j].priority
}
func (h providerHeap) Swap(i, j int) {
h[i], h[j] = h[j], h[i]
}
func (h *providerHeap) Push(x interface{}) {
*h = append(*h, x.(providerWithPriority))
}
func (h *providerHeap) Pop() interface{} {
last := len(*h) - 1
x := (*h)[last]
*h = (*h)[:last]
return x
}