public static KeyStore load()

in jsign-core/src/main/java/net/jsign/KeyStoreUtils.java [47:85]
34 lines of code
16 McCabe index (conditional complexity)

    public static KeyStore load(File keystore, String storetype, String storepass, Provider provider) throws KeyStoreException {
        if (keystore != null && storetype == null) {
            // guess the type of the keystore from the extension of the file
            String filename = keystore.getName().toLowerCase();
            if (filename.endsWith(".p12") || filename.endsWith(".pfx")) {
                storetype = "PKCS12";
            } else if (filename.endsWith(".jceks")) {
                storetype = "JCEKS";
            } else {
                storetype = "JKS";
            }
        }
        
        KeyStore ks;
        try {
            if (provider != null) {
                ks = KeyStore.getInstance(storetype, provider);
            } else {
                ks = KeyStore.getInstance(storetype);
            }
        } catch (KeyStoreException e) {
            throw new KeyStoreException("keystore type '" + storetype + "' is not supported", e);
        }

        boolean filebased = "JKS".equals(storetype) || "JCEKS".equals(storetype) || "PKCS12".equals(storetype);
        if (filebased && (keystore == null || !keystore.exists())) {
            throw new KeyStoreException("The keystore " + keystore + " couldn't be found");
        }
        
        try {
            try (FileInputStream in = !filebased ? null : new FileInputStream(keystore)) {
                ks.load(in, storepass != null ? storepass.toCharArray() : null);
            }
        } catch (Exception e) {
            throw new KeyStoreException("Unable to load the keystore " + keystore, e);
        }
        
        return ks;
    }