The existing code assumed imports to be either imported, or imported with an
alias. Badly formatted files may have duplicate imports for a package, using
different aliases.
This patch refactors the code, and;
Introduces a new `GetImportedNames` function, which returns all name(s) and
aliase(s) for a package, which effectively combines `GetAliasedName` and
`GetImportedName`, but adding support for duplicate imports.
The old `GetAliasedName` and `GetImportedName` functions have been rewritten to
use the new function and marked deprecated, but could be removed if there are no
external consumers.
With this patch, the linter is able to detect issues in files such as;
package main
import (
crand "crypto/rand"
"math/big"
"math/rand"
rand2 "math/rand"
rand3 "math/rand"
)
func main() {
_, _ = crand.Int(crand.Reader, big.NewInt(int64(2))) // good
_ = rand.Intn(2) // bad
_ = rand2.Intn(2) // bad
_ = rand3.Intn(2) // bad
}
Before this patch, only a single issue would be detected:
gosec --quiet .
[main.go:14] - G404 (CWE-338): Use of weak random number generator (math/rand instead of crypto/rand) (Confidence: MEDIUM, Severity: HIGH)
13:
> 14: _ = rand.Intn(2) // bad
15: _ = rand2.Intn(2) // bad
With this patch, all issues are identified:
gosec --quiet .
[main.go:16] - G404 (CWE-338): Use of weak random number generator (math/rand instead of crypto/rand) (Confidence: MEDIUM, Severity: HIGH)
15: _ = rand2.Intn(2) // bad
> 16: _ = rand3.Intn(2) // bad
17: }
[main.go:15] - G404 (CWE-338): Use of weak random number generator (math/rand instead of crypto/rand) (Confidence: MEDIUM, Severity: HIGH)
14: _ = rand.Intn(2) // bad
> 15: _ = rand2.Intn(2) // bad
16: _ = rand3.Intn(2) // bad
[main.go:14] - G404 (CWE-338): Use of weak random number generator (math/rand instead of crypto/rand) (Confidence: MEDIUM, Severity: HIGH)
13:
> 14: _ = rand.Intn(2) // bad
15: _ = rand2.Intn(2) // bad
While working on this change, I noticed that ImportTracker.TrackFile() was not able
to find import aliases; Analyser.Check() called both ImportTracker.TrackFile() and
ast.Walk(), which (with the updated ImportTracker) resulted in importes to be in-
correctly included multiple times (once with the correct alias, once with the default).
I updated ImportTracker.TrackFile() to fix this, but with the updated ImportTracker,
Analyser.Check() no longer has to call ImportTracker.TrackFile() separately, as ast.Walk()
already handles the file, and will find all imports.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
- Get rid of 'core' and move CLI to cmd/gas directory
- Migrate (most) tests to use Ginkgo and testutils framework
- GAS now expects package to reside in $GOPATH
- GAS now can resolve dependencies for better type checking (if package
on GOPATH)
- Simplified public API
