.changes files parsing. #71

deb/changes.go

@@ -0,0 +1,72 @@
+package deb
+
+import (
+	"fmt"
+	"github.com/smira/aptly/utils"
+	"os"
+)
+
+// Changes is a result of .changes file parsing
+type Changes struct {
+	Changes      string
+	Distribution string
+	Files        PackageFiles
+}
+
+// ParseChangesFile does optional signature verification and parses changes files
+func ParseChangesFile(path string, acceptUnsigned, ignoreSignature bool, verifier utils.Verifier) (*Changes, error) {
+	input, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer input.Close()
+
+	isClearSigned, err := verifier.IsClearSigned(input)
+	if err != nil {
+		return nil, err
+	}
+
+	input.Seek(0, 0)
+
+	if !isClearSigned && !acceptUnsigned {
+		return nil, fmt.Errorf(".changes file is not signed and unsigned processing hasn't been enabled")
+	}
+
+	if isClearSigned && !ignoreSignature {
+		err = verifier.VerifyClearsigned(input)
+		if err != nil {
+			return nil, err
+		}
+		input.Seek(0, 0)
+	}
+
+	var text *os.File
+
+	if isClearSigned {
+		text, err = verifier.ExtractClearsigned(input)
+		if err != nil {
+			return nil, err
+		}
+		defer text.Close()
+	} else {
+		text = input
+	}
+
+	reader := NewControlFileReader(text)
+	stanza, err := reader.ReadStanza()
+	if err != nil {
+		return nil, err
+	}
+
+	result := &Changes{
+		Distribution: stanza["Distribution"],
+		Changes:      stanza["Changes"],
+	}
+
+	result.Files, err = result.Files.ParseSumFields(stanza)
+	if err != nil {
+		return nil, err
+	}
+
+	return result, nil
+}