A Go web service that performs various operations on square matrices provided via CSV files.

• Echo: Returns the matrix as a string in matrix format
• Invert: Returns the matrix with columns and rows inverted
• Flatten: Returns the matrix as a single line string
• Sum: Returns the sum of all integers in the matrix
• Multiply: Returns the product of all integers in the matrix

• Go 1.24.4 or higher
• Git

1. Clone the repository:

git clone https://github.com/edtk/go-matrix.git
cd go-matrix

1. Start the server:

go run .

2. The server will start on port 8080.

You can test the endpoints using curl. Here are examples for each operation:

# Echo - Returns the matrix as is
curl -F 'file=@matrix.csv' "localhost:8080/echo"
# Expected output:
# 1,2,3
# 4,5,6
# 7,8,9

# Invert - Returns the matrix with columns and rows inverted
curl -F 'file=@matrix.csv' "localhost:8080/invert"
# Expected output:
# 1,4,7
# 2,5,8
# 3,6,9

# Flatten - Returns the matrix as a single line
curl -F 'file=@matrix.csv' "localhost:8080/flatten"
# Expected output:
# 1,2,3,4,5,6,7,8,9

# Sum - Returns the sum of all integers
curl -F 'file=@matrix.csv' "localhost:8080/sum"
# Expected output:
# 45

# Multiply - Returns the product of all integers
curl -F 'file=@matrix.csv' "localhost:8080/multiply"
# Expected output:
# 362880

The input should be a CSV file containing a square matrix of integers. For example:

1,2,3
4,5,6
7,8,9

Requirements for the input file:

• Must be a square matrix (equal number of rows and columns)
• Must contain only integers
• No header row
• Values separated by commas
• Each row on a new line

The service handles various error cases:

• Invalid CSV format
• Non-square matrices
• Non-integer values
• Empty matrices
• Missing or invalid file uploads

To run the tests:

go test ./matrix