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/
proxy.go
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/
proxy.go
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package proxy
import (
"context"
"net/http"
"net/http/httputil"
"net/url"
"regexp"
"strings"
"github.com/owncloud/ocis-proxy/pkg/proxy/policy"
"go.opencensus.io/plugin/ochttp/propagation/tracecontext"
"go.opencensus.io/trace"
"github.com/owncloud/ocis-pkg/v2/log"
"github.com/owncloud/ocis-proxy/pkg/config"
)
// MultiHostReverseProxy extends httputil to support multiple hosts with diffent policies
type MultiHostReverseProxy struct {
httputil.ReverseProxy
Directors map[string]map[config.RouteType]map[string]func(req *http.Request)
PolicySelector policy.Selector
logger log.Logger
propagator tracecontext.HTTPFormat
config *config.Config
}
// NewMultiHostReverseProxy undocummented
func NewMultiHostReverseProxy(opts ...Option) *MultiHostReverseProxy {
options := newOptions(opts...)
rp := &MultiHostReverseProxy{
Directors: make(map[string]map[config.RouteType]map[string]func(req *http.Request)),
logger: options.Logger,
config: options.Config,
}
if options.Config.Policies == nil {
rp.logger.Info().Str("source", "runtime").Msg("Policies")
options.Config.Policies = defaultPolicies()
} else {
rp.logger.Info().Str("source", "file").Msg("Policies")
}
if options.Config.PolicySelector == nil {
firstPolicy := options.Config.Policies[0].Name
rp.logger.Warn().Msgf("policy-selector not configured. Will always use first policy: '%v'", firstPolicy)
options.Config.PolicySelector = &config.PolicySelector{
Static: &config.StaticSelectorConf{
Policy: firstPolicy,
},
}
}
rp.logger.Debug().
Interface("selector_config", options.Config.PolicySelector).
Msg("loading policy-selector")
policySelector, err := policy.LoadSelector(options.Config.PolicySelector)
if err != nil {
rp.logger.Fatal().Err(err).Msg("Could not load policy-selector")
}
rp.PolicySelector = policySelector
for _, pol := range options.Config.Policies {
for _, route := range pol.Routes {
rp.logger.Debug().Str("fwd: ", route.Endpoint)
uri, err := url.Parse(route.Backend)
if err != nil {
rp.logger.
Fatal().
Err(err).
Msgf("malformed url: %v", route.Backend)
}
rp.logger.
Debug().
Interface("route", route).
Msg("adding route")
rp.AddHost(pol.Name, uri, route)
}
}
return rp
}
func singleJoiningSlash(a, b string) string {
aslash := strings.HasSuffix(a, "/")
bslash := strings.HasPrefix(b, "/")
switch {
case aslash && bslash:
return a + b[1:]
case !aslash && !bslash:
return a + "/" + b
}
return a + b
}
// AddHost undocumented
func (p *MultiHostReverseProxy) AddHost(policy string, target *url.URL, rt config.Route) {
targetQuery := target.RawQuery
if p.Directors[policy] == nil {
p.Directors[policy] = make(map[config.RouteType]map[string]func(req *http.Request))
}
routeType := config.DefaultRouteType
if rt.Type != "" {
routeType = rt.Type
}
if p.Directors[policy][routeType] == nil {
p.Directors[policy][routeType] = make(map[string]func(req *http.Request))
}
p.Directors[policy][routeType][rt.Endpoint] = func(req *http.Request) {
req.URL.Scheme = target.Scheme
req.URL.Host = target.Host
// Apache deployments host addresses need to match on req.Host and req.URL.Host
// see https://stackoverflow.com/questions/34745654/golang-reverseproxy-with-apache2-sni-hostname-error
if rt.ApacheVHost {
req.Host = target.Host
}
req.URL.Path = singleJoiningSlash(target.Path, req.URL.Path)
if targetQuery == "" || req.URL.RawQuery == "" {
req.URL.RawQuery = targetQuery + req.URL.RawQuery
} else {
req.URL.RawQuery = targetQuery + "&" + req.URL.RawQuery
}
if _, ok := req.Header["User-Agent"]; !ok {
// explicitly disable User-Agent so it's not set to default value
req.Header.Set("User-Agent", "")
}
}
}
func (p *MultiHostReverseProxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
var hit bool
pol, err := p.PolicySelector(r.Context(), r)
if err != nil {
p.logger.Error().Msgf("Error while selecting pol %v", err)
}
if _, ok := p.Directors[pol]; !ok {
p.logger.
Error().
Msgf("policy %v is not configured", pol)
}
ctx := context.Background()
var span *trace.Span
// Start root span.
if p.config.Tracing.Enabled {
ctx, span = trace.StartSpan(context.Background(), r.URL.String())
defer span.End()
p.propagator.SpanContextToRequest(span.SpanContext(), r)
}
Loop:
for _, rt := range config.RouteTypes {
var handler func(string, url.URL) bool
switch rt {
case config.QueryRoute:
handler = p.queryRouteMatcher
case config.RegexRoute:
handler = p.regexRouteMatcher
case config.PrefixRoute:
fallthrough
default:
handler = p.prefixRouteMatcher
}
for endpoint := range p.Directors[pol][rt] {
if handler(endpoint, *r.URL) {
p.Director = p.Directors[pol][rt][endpoint]
hit = true
p.logger.
Debug().
Str("policy", pol).
Str("prefix", endpoint).
Str("path", r.URL.Path).
Str("routeType", string(rt)).
Msg("director found")
break Loop
}
}
}
// override default director with root. If any
if !hit && p.Directors[pol][config.PrefixRoute]["/"] != nil {
p.Director = p.Directors[pol][config.PrefixRoute]["/"]
}
// Call upstream ServeHTTP
p.ReverseProxy.ServeHTTP(w, r.WithContext(ctx))
}
func (p MultiHostReverseProxy) queryRouteMatcher(endpoint string, target url.URL) bool {
u, _ := url.Parse(endpoint)
if strings.HasPrefix(target.Path, u.Path) && endpoint != "/" {
query := u.Query()
if len(query) != 0 {
rQuery := target.Query()
match := true
for k := range query {
v := query.Get(k)
rv := rQuery.Get(k)
if rv != v {
match = false
break
}
}
return match
}
}
return false
}
func (p *MultiHostReverseProxy) regexRouteMatcher(endpoint string, target url.URL) bool {
matched, err := regexp.MatchString(endpoint, target.String())
if err != nil {
p.logger.Warn().Err(err).Msgf("regex with pattern %s failed", endpoint)
}
return matched
}
func (p *MultiHostReverseProxy) prefixRouteMatcher(endpoint string, target url.URL) bool {
return strings.HasPrefix(target.Path, endpoint) && endpoint != "/"
}
func defaultPolicies() []config.Policy {
return []config.Policy{
{
Name: "reva",
Routes: []config.Route{
{
Endpoint: "/",
Backend: "http://localhost:9100",
},
{
Endpoint: "/.well-known/",
Backend: "http://localhost:9130",
},
{
Endpoint: "/konnect/",
Backend: "http://localhost:9130",
},
{
Endpoint: "/signin/",
Backend: "http://localhost:9130",
},
{
Type: config.RegexRoute,
Endpoint: "/ocs/v[12].php/cloud/user", // we have `user` and `users` in ocis-ocs
Backend: "http://localhost:9110",
},
{
Endpoint: "/ocs/",
Backend: "http://localhost:9140",
},
{
Type: config.QueryRoute,
Endpoint: "/remote.php/?preview=1",
Backend: "http://localhost:9115",
},
{
Endpoint: "/remote.php/",
Backend: "http://localhost:9140",
},
{
Endpoint: "/dav/",
Backend: "http://localhost:9140",
},
{
Endpoint: "/webdav/",
Backend: "http://localhost:9140",
},
{
Endpoint: "/status.php",
Backend: "http://localhost:9140",
},
{
Endpoint: "/index.php/",
Backend: "http://localhost:9140",
},
{
Endpoint: "/data",
Backend: "http://localhost:9140",
},
// if we were using the go micro api gateway we could look up the endpoint in the registry dynamically
{
Endpoint: "/api/v0/accounts",
Backend: "http://localhost:9181",
},
// TODO the lookup needs a better mechanism
{
Endpoint: "/accounts.js",
Backend: "http://localhost:9181",
},
{
Endpoint: "/api/v0/settings",
Backend: "http://localhost:9190",
},
{
Endpoint: "/settings.js",
Backend: "http://localhost:9190",
},
},
},
{
Name: "oc10",
Routes: []config.Route{
{
Endpoint: "/",
Backend: "http://localhost:9100",
},
{
Endpoint: "/.well-known/",
Backend: "http://localhost:9130",
},
{
Endpoint: "/konnect/",
Backend: "http://localhost:9130",
},
{
Endpoint: "/signin/",
Backend: "http://localhost:9130",
},
{
Endpoint: "/ocs/",
Backend: "https://demo.owncloud.com",
ApacheVHost: true,
},
{
Endpoint: "/remote.php/",
Backend: "https://demo.owncloud.com",
ApacheVHost: true,
},
{
Endpoint: "/dav/",
Backend: "https://demo.owncloud.com",
ApacheVHost: true,
},
{
Endpoint: "/webdav/",
Backend: "https://demo.owncloud.com",
ApacheVHost: true,
},
{
Endpoint: "/status.php",
Backend: "https://demo.owncloud.com",
ApacheVHost: true,
},
{
Endpoint: "/index.php/",
Backend: "https://demo.owncloud.com",
ApacheVHost: true,
},
{
Endpoint: "/data",
Backend: "https://demo.owncloud.com",
ApacheVHost: true,
},
},
},
}
}