forked from coinbase/mesh-sdk-go
/
populator.go
55 lines (46 loc) · 1.48 KB
/
populator.go
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// Copyright 2020 Coinbase, Inc.
//
// 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.
package worker
import (
"fmt"
"log"
"regexp"
"strings"
"github.com/tidwall/gjson"
)
// PopulateInput populates user defined variables in the input
// with their corresponding values from the execution state.
func PopulateInput(state string, input string) (string, error) {
re := regexp.MustCompile(`\{\{[^\}]*\}\}`)
var err error
input = re.ReplaceAllStringFunc(input, func(match string) string {
// remove special characters
match = strings.Replace(match, "{{", "", 1)
match = strings.Replace(match, "}}", "", 1)
value := gjson.Get(state, match)
if !value.Exists() {
err = fmt.Errorf("%s is not present in state: %w", match, ErrVariableNotFound)
return ""
}
return value.Raw
})
if err != nil {
return "", fmt.Errorf("unable to insert variables: %w", err)
}
if !gjson.Valid(input) {
log.Printf("invalid json: %s\n", input)
return "", ErrInvalidJSON
}
return input, nil
}