open-consul/agent/intentions_endpoint.go

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package agent
import (
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"fmt"
"net/http"
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"strings"
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"github.com/hashicorp/consul/agent/consul"
"github.com/hashicorp/consul/agent/structs"
)
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// /v1/connection/intentions
func (s *HTTPServer) IntentionEndpoint(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
switch req.Method {
case "GET":
return s.IntentionList(resp, req)
case "POST":
return s.IntentionCreate(resp, req)
default:
return nil, MethodNotAllowedError{req.Method, []string{"GET", "POST"}}
}
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}
// GET /v1/connect/intentions
func (s *HTTPServer) IntentionList(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Method is tested in IntentionEndpoint
var args structs.DCSpecificRequest
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
var reply structs.IndexedIntentions
if err := s.agent.RPC("Intention.List", &args, &reply); err != nil {
return nil, err
}
return reply.Intentions, nil
}
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// POST /v1/connect/intentions
func (s *HTTPServer) IntentionCreate(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Method is tested in IntentionEndpoint
args := structs.IntentionRequest{
Op: structs.IntentionOpCreate,
}
s.parseDC(req, &args.Datacenter)
s.parseToken(req, &args.Token)
if err := decodeBody(req, &args.Intention, nil); err != nil {
return nil, fmt.Errorf("Failed to decode request body: %s", err)
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}
var reply string
if err := s.agent.RPC("Intention.Apply", &args, &reply); err != nil {
return nil, err
}
return intentionCreateResponse{reply}, nil
}
// GET /v1/connect/intentions/match
func (s *HTTPServer) IntentionMatch(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Prepare args
args := &structs.IntentionQueryRequest{Match: &structs.IntentionQueryMatch{}}
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
q := req.URL.Query()
// Extract the "by" query parameter
if by, ok := q["by"]; !ok || len(by) != 1 {
return nil, fmt.Errorf("required query parameter 'by' not set")
} else {
switch v := structs.IntentionMatchType(by[0]); v {
case structs.IntentionMatchSource, structs.IntentionMatchDestination:
args.Match.Type = v
default:
return nil, fmt.Errorf("'by' parameter must be one of 'source' or 'destination'")
}
}
// Extract all the match names
names, ok := q["name"]
if !ok || len(names) == 0 {
return nil, fmt.Errorf("required query parameter 'name' not set")
}
// Build the entries in order. The order matters since that is the
// order of the returned responses.
args.Match.Entries = make([]structs.IntentionMatchEntry, len(names))
for i, n := range names {
entry, err := parseIntentionMatchEntry(n)
if err != nil {
return nil, fmt.Errorf("name %q is invalid: %s", n, err)
}
args.Match.Entries[i] = entry
}
var reply structs.IndexedIntentionMatches
if err := s.agent.RPC("Intention.Match", args, &reply); err != nil {
return nil, err
}
// We must have an identical count of matches
if len(reply.Matches) != len(names) {
return nil, fmt.Errorf("internal error: match response count didn't match input count")
}
// Use empty list instead of nil.
response := make(map[string]structs.Intentions)
for i, ixns := range reply.Matches {
response[names[i]] = ixns
}
return response, nil
}
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// GET /v1/connect/intentions/check
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func (s *HTTPServer) IntentionCheck(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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// Prepare args
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args := &structs.IntentionQueryRequest{Check: &structs.IntentionQueryCheck{}}
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if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
q := req.URL.Query()
// Set the source type if set
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args.Check.SourceType = structs.IntentionSourceConsul
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if sourceType, ok := q["source-type"]; ok && len(sourceType) > 0 {
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args.Check.SourceType = structs.IntentionSourceType(sourceType[0])
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}
// Extract the source/destination
source, ok := q["source"]
if !ok || len(source) != 1 {
return nil, fmt.Errorf("required query parameter 'source' not set")
}
destination, ok := q["destination"]
if !ok || len(destination) != 1 {
return nil, fmt.Errorf("required query parameter 'destination' not set")
}
// We parse them the same way as matches to extract namespace/name
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args.Check.SourceName = source[0]
if args.Check.SourceType == structs.IntentionSourceConsul {
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entry, err := parseIntentionMatchEntry(source[0])
if err != nil {
return nil, fmt.Errorf("source %q is invalid: %s", source[0], err)
}
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args.Check.SourceNS = entry.Namespace
args.Check.SourceName = entry.Name
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}
// The destination is always in the Consul format
entry, err := parseIntentionMatchEntry(destination[0])
if err != nil {
return nil, fmt.Errorf("destination %q is invalid: %s", destination[0], err)
}
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args.Check.DestinationNS = entry.Namespace
args.Check.DestinationName = entry.Name
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var reply structs.IntentionQueryCheckResponse
if err := s.agent.RPC("Intention.Check", args, &reply); err != nil {
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return nil, err
}
return &reply, nil
}
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// IntentionSpecific handles the endpoint for /v1/connection/intentions/:id
func (s *HTTPServer) IntentionSpecific(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
id := strings.TrimPrefix(req.URL.Path, "/v1/connect/intentions/")
switch req.Method {
case "GET":
return s.IntentionSpecificGet(id, resp, req)
case "PUT":
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return s.IntentionSpecificUpdate(id, resp, req)
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case "DELETE":
return s.IntentionSpecificDelete(id, resp, req)
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default:
return nil, MethodNotAllowedError{req.Method, []string{"GET", "PUT", "DELETE"}}
}
}
// GET /v1/connect/intentions/:id
func (s *HTTPServer) IntentionSpecificGet(id string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Method is tested in IntentionEndpoint
args := structs.IntentionQueryRequest{
IntentionID: id,
}
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
var reply structs.IndexedIntentions
if err := s.agent.RPC("Intention.Get", &args, &reply); err != nil {
// We have to check the string since the RPC sheds the error type
if err.Error() == consul.ErrIntentionNotFound.Error() {
resp.WriteHeader(http.StatusNotFound)
fmt.Fprint(resp, err.Error())
return nil, nil
}
return nil, err
}
// This shouldn't happen since the called API documents it shouldn't,
// but we check since the alternative if it happens is a panic.
if len(reply.Intentions) == 0 {
resp.WriteHeader(http.StatusNotFound)
return nil, nil
}
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return reply.Intentions[0], nil
}
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// PUT /v1/connect/intentions/:id
func (s *HTTPServer) IntentionSpecificUpdate(id string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Method is tested in IntentionEndpoint
args := structs.IntentionRequest{
Op: structs.IntentionOpUpdate,
}
s.parseDC(req, &args.Datacenter)
s.parseToken(req, &args.Token)
if err := decodeBody(req, &args.Intention, nil); err != nil {
resp.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(resp, "Request decode failed: %v", err)
return nil, nil
}
// Use the ID from the URL
args.Intention.ID = id
var reply string
if err := s.agent.RPC("Intention.Apply", &args, &reply); err != nil {
return nil, err
}
// Update uses the same create response
return intentionCreateResponse{reply}, nil
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}
// DELETE /v1/connect/intentions/:id
func (s *HTTPServer) IntentionSpecificDelete(id string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Method is tested in IntentionEndpoint
args := structs.IntentionRequest{
Op: structs.IntentionOpDelete,
Intention: &structs.Intention{ID: id},
}
s.parseDC(req, &args.Datacenter)
s.parseToken(req, &args.Token)
var reply string
if err := s.agent.RPC("Intention.Apply", &args, &reply); err != nil {
return nil, err
}
return true, nil
}
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// intentionCreateResponse is the response structure for creating an intention.
type intentionCreateResponse struct{ ID string }
// parseIntentionMatchEntry parses the query parameter for an intention
// match query entry.
func parseIntentionMatchEntry(input string) (structs.IntentionMatchEntry, error) {
var result structs.IntentionMatchEntry
result.Namespace = structs.IntentionDefaultNamespace
// TODO(mitchellh): when namespaces are introduced, set the default
// namespace to be the namespace of the requestor.
// Get the index to the '/'. If it doesn't exist, we have just a name
// so just set that and return.
idx := strings.IndexByte(input, '/')
if idx == -1 {
result.Name = input
return result, nil
}
result.Namespace = input[:idx]
result.Name = input[idx+1:]
if strings.IndexByte(result.Name, '/') != -1 {
return result, fmt.Errorf("input can contain at most one '/'")
}
return result, nil
}