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Adding basic redaction functionality
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| package redact | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "fmt" | ||
| "io" | ||
| "regexp" | ||
| ) | ||
|
|
||
| type MultiLineRedactor struct { | ||
| re1 *regexp.Regexp | ||
| re2 *regexp.Regexp | ||
| maskText string | ||
| } | ||
|
|
||
| func NewMultiLineRedactor(re1, re2, maskText string) (*MultiLineRedactor, error) { | ||
| compiled1, err := regexp.Compile(re1) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| compiled2, err := regexp.Compile(re2) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &MultiLineRedactor{re1: compiled1, re2: compiled2, maskText: maskText}, nil | ||
| } | ||
|
|
||
| func (r *MultiLineRedactor) Redact(input io.Reader) io.Reader { | ||
| reader, writer := io.Pipe() | ||
| go func() { | ||
| var err error | ||
| defer func() { | ||
| writer.CloseWithError(err) | ||
| }() | ||
|
|
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| substStr := getReplacementPattern(r.re2, r.maskText) | ||
|
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| reader := bufio.NewReader(input) | ||
| line1, line2, err := getNextTwoLines(reader, nil) | ||
| if err != nil { | ||
| // this will print 2 blank lines for empty input... | ||
| fmt.Fprintf(writer, "%s\n", line1) | ||
| fmt.Fprintf(writer, "%s\n", line2) | ||
| return | ||
| } | ||
|
|
||
| flushLastLine := false | ||
| for err == nil { | ||
| // If line1 matches re1, then transform line2 using re2 | ||
| if !r.re1.MatchString(line1) { | ||
| fmt.Fprintf(writer, "%s\n", line1) | ||
| line1, line2, err = getNextTwoLines(reader, &line2) | ||
| flushLastLine = true | ||
| continue | ||
| } | ||
| flushLastLine = false | ||
|
|
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| clean := r.re2.ReplaceAllString(line2, substStr) | ||
|
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| // io.WriteString would be nicer, but reader strips new lines | ||
| fmt.Fprintf(writer, "%s\n%s\n", line1, clean) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| line1, line2, err = getNextTwoLines(reader, nil) | ||
| } | ||
|
|
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| if flushLastLine { | ||
| fmt.Fprintf(writer, "%s\n", line1) | ||
| } | ||
| }() | ||
| return reader | ||
| } | ||
|
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| func getNextTwoLines(reader *bufio.Reader, curLine2 *string) (line1 string, line2 string, err error) { | ||
| line1 = "" | ||
| line2 = "" | ||
|
|
||
| if curLine2 == nil { | ||
| line1, err = readLine(reader) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| line2, err = readLine(reader) | ||
| return | ||
| } | ||
|
|
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| line1 = *curLine2 | ||
| line2, err = readLine(reader) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| return | ||
| } |
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