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caddyhttp: CEL matcher checks return type; slight refactor

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As per https://github.com/caddyserver/caddy/issues/3051#issuecomment-611200414
This commit is contained in:
Matthew Holt 2020-04-08 15:39:23 -06:00
parent 7dfd69cdc5
commit e5dc76b054
3 changed files with 10 additions and 7 deletions
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1
go.mod
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@ -10,6 +10,7 @@ require (
github.com/cenkalti/backoff/v4 v4.0.2 // indirect
github.com/dustin/go-humanize v1.0.1-0.20200219035652-afde56e7acac
github.com/go-acme/lego/v3 v3.5.0
github.com/gogo/protobuf v1.3.1
github.com/google/cel-go v0.4.1
github.com/jsternberg/zap-logfmt v1.2.0
github.com/klauspost/compress v1.10.3

1
go.sum
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@ -249,6 +249,7 @@ github.com/gofrs/uuid v3.2.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRx
github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
github.com/gogo/protobuf v1.2.0/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
github.com/gogo/protobuf v1.3.1 h1:DqDEcV5aeaTmdFBePNpYsp3FlcVH/2ISVVM9Qf8PSls=
github.com/gogo/protobuf v1.3.1/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXPKa29o=
github.com/goji/httpauth v0.0.0-20160601135302-2da839ab0f4d/go.mod h1:nnjvkQ9ptGaCkuDUx6wNykzzlUixGxvkme+H/lnzb+A=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=

15
modules/caddyhttp/celmatcher.go
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@ -24,6 +24,7 @@ import (
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/gogo/protobuf/proto"
"github.com/google/cel-go/cel"
"github.com/google/cel-go/checker/decls"
"github.com/google/cel-go/common/types"
@ -99,16 +100,16 @@ func (m *MatchExpression) Provision(_ caddy.Context) error {
return fmt.Errorf("setting up CEL environment: %v", err)
}
// parse the expression
parsed, issues := env.Parse(m.expandedExpr)
// parse and type-check the expression
checked, issues := env.Compile(m.expandedExpr)
if issues != nil && issues.Err() != nil {
return fmt.Errorf("parsing CEL program: %s", issues.Err())
return fmt.Errorf("compiling CEL program: %s", issues.Err())
}
// type-check it
checked, issues := env.Check(parsed)
if issues != nil && issues.Err() != nil {
return fmt.Errorf("type-checking CEL program: %s", issues.Err())
// request matching is a boolean operation, so we don't really know
// what to do if the expression returns a non-boolean type
if !proto.Equal(checked.ResultType(), decls.Bool) {
return fmt.Errorf("CEL request matcher expects return type of bool, not %s", checked.ResultType())
}
// compile the "program"